CN105900068A - Path management system, device and method - Google Patents

Abstract

Provided in an embodiment of the present invention are a path management system, device and method. The path management system comprises a server and a storage device. At least one session connection exists between an initiator of the server and a plurality of controllers of the storage device. When a path is determined to be added between the server and the storage device, the server triggers the path to add operation. According to an identification of the initiator and the correlation between a starting node and a destination node of the stored and established session connection, a scheduler of the storage device determines a target controller for a new path from the plurality of controllers. In this way, a server can automatically request a target controller, and add the path of the target controller of the storage device to a pre-existing path, thus realizing dynamic management function of a path, and avoiding the problem of network transmission quality reduction caused by a path malfunction.

Description

System, device and method for route management technical field

The present invention relates to the computer field, in particular to a path management system, device and method.

Background technique

In the traditional data center scenario, the storage array in the storage device is small in scale and the number of storage controllers is small, generally 1-4. After the storage device is installed, there are few hardware and configuration changes. Therefore, the traditional storage device The access path is generally configured statically.

With the rapid development of data centers, the storage scale of various applications is getting larger and larger, and the performance requirements for storage devices are also getting higher and higher. Traditional storage arrays are moving toward a distributed architecture. The scale of storage arrays is getting larger and larger, the capacity provided is constantly increasing, and the number of controllers is also increasing significantly. Controllers and disks can access each other through the network, thereby forming a large-scale multi-path access network matrix. Since the storage array adopts a distributed architecture, storage devices and network configurations change frequently. When a path fails, the number of statically configured available paths decreases, resulting in a decrease in network transmission quality. At the same time, if the number of paths is too small, functional requirements such as load balancing and automatic path switching after path failure cannot be met.

Contents of the invention

The object of the present invention is to provide a path management method, device and system to solve the problem that path dynamic management cannot be realized in a distributed storage array.

In the first aspect, an embodiment of the present invention provides a path management system, including a server and a storage device, the storage device includes a scheduler and multiple controllers, and at least one session is established between the server and the storage device connection, the starting node of the path corresponding to each session connection is the initiator of the server, the target node of the path corresponding to each session connection is the controller in the storage device, and the storage device stores the The corresponding relationship between the starting node and the target node of the established session connection,

The server is configured to trigger a path adding operation when it is determined that the path between the server and the storage device needs to be added;

The scheduler is configured to receive a path addition request triggered by the server, where the path addition request carries an identifier of an initiator of the server, and according to the identifier of the initiator and the stored established session The corresponding relationship between the starting node and the target node of the connection, determining the target controller of the new path from the plurality of controllers, and sending the determined identifier of the target controller to the server, wherein the No session connection is established between the target controller and the initiator;

The server is further configured to establish a path with the target controller according to the identifier of the target controller.

In a first possible implementation manner of the first aspect, the server side stores multi-path information, where the multi-path information includes information for identifying a path and a path state.

With reference to the first aspect or the first possible implementation manner of the first aspect, in the second possible implementation manner, when there are multiple target controllers for the determined new path,

The scheduler is further configured to determine at least one target controller meeting the following conditions from the plurality of target controllers:

The controller has the fewest number of initiators connected.

With reference to the first possible implementation manner of the first aspect, in a third possible implementation manner, the server is further configured to determine the number of currently available paths according to the multipath information, and when the available path entries When the number is less than the preset threshold, it is determined that the path between the server and the storage device needs to be increased.

With reference to any one of the first to third possible implementation manners of the first aspect, in a fourth possible implementation manner, the server is further configured to, via any available path, send sending a status query instruction, so that the target node of any available path sends a status query message to the scheduler, and the status query message carries an identifier of a controller that has a session connection with the initiator of the server;

The scheduler is further configured to receive the status query message, acquire the status information of the controller that has a session connection with the initiator of the server, and send the acquired initiator to the server The status information of the controller with session connection is returned to the server through the target node of any available path;

The server is further configured to, according to the received status information of the controller having a session connection with the initiator of the server, delete the recorded path corresponding to the unavailable controller in the multi-path information, wherein the The information identifying the path includes the controller identification.

With reference to any one of the first to fourth possible implementation manners of the first aspect, in a fifth possible implementation manner, the server is further configured to send a periodic detection instruction to the controller that has a session connection with itself , receiving a returned detection response message, determining an unavailable path according to the detection response message, and updating a path status corresponding to the unavailable path in the multipath information.

With reference to any one of the first to fifth possible implementation manners of the first aspect, in a sixth possible implementation manner, the server is specifically configured to send a path addition instruction to a target node of any available path to trigger The target node of any available path sends the path addition request to the scheduler.

With reference to any one of the first to fifth possible implementation manners of the first aspect, in a seventh possible implementation manner, the server is specifically configured to trigger the path addition request, and send the request to the The scheduler sends the path addition request, and receives the identifier of the target controller returned by the scheduler through the dedicated switch.

With reference to any one of the first to fifth possible implementation manners of the first aspect, in an eighth possible implementation manner, the server is further configured to send a status query request to the scheduler through a dedicated switch, so The status query request carries the identifier of the controller that has a session connection with the initiator of the server;

The scheduler is further configured to receive the status query message, obtain the status information of the controller that has a session connection with the initiator of the server, and send the controller that has a session connection with the initiator of the server The status information of the controller is returned to the server through the private switch, so that the server deletes the path corresponding to the unavailable controller in the recorded multi-path information, wherein the information identifying the path includes a controller identifier.

With reference to the first possible implementation manner of the first aspect, in a ninth possible implementation manner, the multipath information is stored in a configuration file on the server side.

In a second aspect, the embodiment of the present invention provides a server, including a multipath management module and an initiator,

The initiator is used to establish at least one session connection with the storage device, the starting node of the path corresponding to each session connection is the initiator of the server, and the target node of the path corresponding to each session connection is the the controller in the storage device;

A multipath management module, configured to trigger a path addition operation when it is determined that the path between the server and the storage device needs to be added, so that the scheduler of the storage device Establishing a corresponding relationship between the starting node and the target node of the session connection, determining the target controller of the new path from the plurality of controllers of the storage device;

The initiator is further configured to establish a path between the target controllers according to the identifiers of the target controllers sent by the storage device.

In a first possible implementation manner of the second aspect, the server side stores multi-path information, where the multi-path information includes information for identifying a path and a path status.

With reference to the first possible implementation manner of the second aspect, in a second possible implementation manner, the multipath management module is further configured to determine the number of currently available paths according to the multipath information, and when the available When the number of paths is less than the preset threshold, it is determined that the path between the server and the storage device needs to be increased.

With reference to any possible implementation manner in the first aspect of the second aspect or the second aspect of the second aspect, in a third possible implementation manner, the initiator is further configured to send The periodic detection instruction receives a returned detection response message, determines an unavailable path according to the detection response message, and updates the path status corresponding to the unavailable path in the multi-path information.

In combination with any of the first to third possible implementation manners of the second aspect, in a fourth possible implementation manner,

The multipath management module is specifically configured to send a control instruction for initiating a path addition operation to the initiator;

The initiator is specifically configured to send a path addition instruction to a target node of any available path according to the control instruction, where the path addition instruction carries an identifier of the initiator.

In combination with any of the first to fourth possible implementation manners of the second aspect, in the fifth possible implementation manner In the implementation mode,

The initiator is further configured to receive the controller status request message sent by the multipath management module, and send a status query instruction to the target node of the any available path through any available path, and the status query instruction carries the the identity of the controller to which the said initiator has a session connection;

The initiator is further configured to receive the status information of the controller that has a session connection with the initiator of the server returned by the scheduler through any available path, and delete the unavailable control in the recorded multipath information. A path corresponding to the controller, wherein the information identifying the path includes a controller identifier.

In combination with any possible implementation manner of the second aspect to the third aspect of the second aspect, in a sixth possible implementation manner,

The multipath management module is specifically configured to send a path addition request to the scheduler of the storage device through a dedicated switch, where the path addition request carries the identifier of the initiator;

The multipath management module is further configured to receive the identifier of the target controller returned by the scheduler, and notify the initiator to establish a new path with the target controller.

In combination with any possible implementation manner of the second aspect to the third aspect of the second aspect, in a seventh possible implementation manner,

The multipath management module is further configured to send a status query message to the scheduler of the storage device through a dedicated switch, where the status query message carries an identifier of a controller that has a session connection with the initiator;

The multi-path management module is further configured to receive the status information of the controller that has a session connection with the initiator returned by the scheduler, and delete the path corresponding to the unavailable controller in the recorded multi-path information, wherein , the information identifying the path includes a controller identifier.

With reference to the first possible implementation manner of the second aspect, in an eighth possible implementation manner, the multipath information is stored in a configuration file on the server side.

In a third aspect, an embodiment of the present invention provides a storage device, where the storage device includes multiple controllers and schedulers,

At least one controller among the plurality of controllers is configured to establish a session connection with the server, the starting node of the path corresponding to the session connection is the initiator of the server, and the corresponding session connection The target node of the path is the controller in the storage device, and the storage device stores the corresponding relationship between the starting node and the target node of the established session connection;

The scheduler is configured to receive a path addition request triggered by the server, where the path addition request carries an identifier of an initiator of the server, and according to the identifier of the initiator and the stored established session The corresponding relationship between the starting node and the target node of the connection, determining the target controller of the new path from the plurality of controllers, and sending the determined identifier of the target controller to the server, wherein the No session connection is established between the target controller and the initiator;

The target controller is configured to establish a new path with the initiator of the server.

With reference to the third aspect, in the first possible implementation manner of the third aspect, when there are multiple target controllers for the determined new path,

The scheduler is also used to determine at least one target controller that meets the following conditions from multiple target controllers:

The controller has the fewest number of initiators connected.

With reference to the third aspect or the first possible implementation manner of the third aspect, in the second possible implementation manner,

The scheduler is further configured to receive a status query message triggered by the server, where the status query message carries an identifier of a controller that has a session connection with the initiator of the server;

The scheduler is further configured to obtain the state information of the controller having a session connection with the initiator of the server according to the identifier of the controller having a session connection with the initiator of the server, and the acquired state information returned to the server.

With reference to the second possible implementation manner of the third aspect, in the third possible implementation manner,

The scheduler is specifically configured to receive the status query message sent by the server through the target node of any available path, and pass the status information of the controller having a session connection with the initiator of the server through the arbitrary available path The target node of is returned to the server; or,

The scheduler is specifically configured to receive the status query message sent by the multi-path management module of the server through the dedicated switch, and pass the status information of the controller having a session connection with the initiator of the server through the dedicated switch returned to the server.

In a fourth aspect, an embodiment of the present invention provides a path management method, which is applied to a path management system, where the path management system includes a server and a storage device, and the storage device includes a scheduler and multiple controllers,

The server establishes at least one session connection with the storage device, the starting node of the path corresponding to each session connection is the initiator of the server, and the target node of the path corresponding to each session connection is the The controller in the storage device, the storage device stores the corresponding relationship between the starting node and the target node of the established session connection;

When it is determined that the path between the server and the storage device needs to be increased, the server triggers a path addition operation;

The scheduler receives the path addition request triggered by the server, the path addition request carries the identifier of the initiator of the server, and according to the identifier of the initiator and the stored initiator of the established session connection The corresponding relationship between the starting node and the target node, determine the target controller of the new path from the plurality of controllers, and send the determined identifier of the target controller to the server, wherein the target controller No session connection is established with said initiator;

The server establishes a path with the target controller according to the identifier of the target controller.

With reference to the fourth aspect, in a first possible implementation manner of the fourth aspect, the server side stores multi-path information, where the multi-path information includes information for identifying a path and a path status.

With reference to the fourth aspect or the first possible implementation manner of the fourth aspect, in the second possible implementation manner, when there are multiple target controllers for the determined new path, the method further includes:

The scheduler determines at least one target controller meeting the following conditions from the plurality of target controllers:

The controller has the fewest number of initiators connected.

With reference to the first or second possible implementation manner of the fourth aspect, in a third possible implementation manner, the method further includes:

The server determines the number of currently available paths according to the multipath information, and when the number of available paths is less than a preset threshold, it is determined that the path between the server and the storage device needs to be increased. path.

With reference to any one of the first to third possible implementation manners of the fourth aspect, in a fourth possible implementation manner, the method further includes:

The server sends a status query instruction to the target node of any available path through any available path, so that the target node of the available path sends a status query message to the scheduler, and the status query message carries an identification of the controller with which the initiator of said server has a session connection;

The scheduler receives the status query message, acquires the status information of the controller that has a session connection with the initiator of the server, and uses the obtained status information of the controller that has a session connection with the initiator of the server State information is returned to the server through the target node of any available path;

The server deletes the path corresponding to the unavailable controller in the recorded multi-path information according to the received state information of the controller having a session connection with the initiator of the server, wherein the identified path Information includes controller identification.

With reference to any one of the first to fourth possible implementation manners of the fourth aspect, in a fifth possible implementation manner, the method further includes:

The server sends a periodic detection instruction to the controller having a session connection with itself, receives a returned detection response message, determines an unavailable path according to the detection response message, and updates the path status corresponding to the unavailable path in the multi-path information .

With reference to any one of the first to fifth possible implementation manners of the fourth aspect, in a sixth possible implementation manner, the trigger path adding operation includes:

The server sends a path addition instruction to the target node of any available path, so as to trigger the target node of any available path to send the path addition request to the scheduler.

With reference to the fourth aspect and any one of the first to third possible implementation manners of the fourth aspect, in a seventh possible implementation manner, the trigger path adding operation includes:

The server sends the path addition request to the scheduler through a dedicated switch.

In combination with the fourth aspect and any of the first to third possible implementation modes of the fourth aspect, in In eight possible implementation manners, the method also includes:

The server sends a status query request to the scheduler through a dedicated switch, and the status query request carries an identifier of a controller having a session connection with the initiator of the server;

The scheduler receives the status query message, acquires the status information of the controller having a session connection with the initiator of the server, and sends the status information of the controller having a session connection with the initiator of the server Returning to the server through the private switch, so that the server deletes the path corresponding to the unavailable controller in the recorded multi-path information, where the information identifying the path includes the controller identifier.

In the fifth aspect, the embodiment of the present invention also provides a path management method, which is applied to a path management system, where the path management system includes a server and a storage device, and the storage device includes multiple controllers and schedulers, the Methods include:

A session connection is established between at least one controller among the plurality of controllers and the server, the starting node of the path corresponding to the session connection is the initiator of the server, and the target node of the path corresponding to the session connection is The controller in the storage device, where the storage device stores the corresponding relationship between the starting node and the target node of the established session connection;

The scheduler receives the path addition request triggered by the server, the path addition request carries the identifier of the initiator of the server, and according to the identifier of the initiator and the stored initiator of the established session connection The corresponding relationship between the starting node and the target node, determine the target controller of the new path from the plurality of controllers, and send the determined identifier of the target controller to the server, wherein the target controller No session connection is established with said initiator;

The target controller establishes a new path with the server's initiator.

With reference to the fifth aspect, in the first possible implementation manner of the fifth aspect, when there are multiple target controllers for the determined new path, the method further includes:

The scheduler determines at least one target controller meeting the following condition from among the multiple target controllers: the number of initiators connected to the controller is the smallest.

With reference to the fifth aspect, in a second possible implementation manner of the fifth aspect, the method further includes:

At least one controller among the plurality of controllers receives the status query instruction sent by the server order, sending a status query message to the scheduler, where the status query message carries an identifier of a controller that has a session connection with the initiator of the server;

The scheduler receives the status query message, acquires the status information of the controller that has a session connection with the initiator of the server, and uses the obtained status information of the controller that has a session connection with the initiator of the server The status information is returned to the server through the target node of any available path, so that the server deletes the path corresponding to the unavailable controller in the recorded multipath information.

In the sixth aspect, the embodiment of the present invention also provides a path management method, which is applied to a path management system, the path management system includes a server and a storage device, the server includes a multipath management module and an initiator, and the storage The device includes a scheduler and multiple controllers, wherein there is at least one session connection between the initiator of the server and the multiple controllers of the storage device, and the starting node of the path corresponding to each session connection is the The initiator of the server, the target node of the path corresponding to each session connection is the controller in the storage device, and the storage device stores the correspondence between the start node and the target node of the established session connection ,

The initiator receives the control instruction sent by the multipath management module when it is determined that the path between the server and the storage device needs to be added, and the control instruction is used to notify the initiator to perform a path increase operation;

The initiator sends a path addition instruction to the target node of the arbitrary available path through any available path, and the path addition instruction carries the identifier of the initiator;

The scheduler receives a path allocation request sent by the target node of any available path according to the path addition instruction, and the path allocation request carries the identifier of the initiator;

The scheduler determines the target controller of the new path from the plurality of controllers according to the identifier of the initiator and the stored correspondence between the start node and the target node of the established session connection, sending the determined identifier of the target controller to the server, wherein no session connection is established between the target controller and the initiator;

The server establishes a path with the target controller according to the identifier of the target controller.

In the seventh aspect, the embodiment of the present invention also provides a path management device, characterized in that the device includes a processor, a memory, a bus, and a communication interface;

The memory is used to store computer-executable instructions, the processor is connected to the memory through the bus, and when the path management device is running, the processor executes the computer-executable instructions stored in the memory, The path management device is configured to execute the path management method described in any one of the fourth to sixth aspects.

In an eighth aspect, an embodiment of the present invention also provides a computer-readable medium, including computer-executable instructions, so that when a processor of a computer executes the computer-executable instructions, the computer executes any one of the fourth to sixth aspects. A method for path management.

Embodiments of the present invention provide a path management system, device, and method. The path management system includes a server and a storage device. There is at least one session connection between the initiator of the server and multiple controllers of the storage device. When it is determined that the path between the server and the storage device needs to be increased, a path addition operation is triggered, and the scheduler of the storage device connects the starting node and the target according to the identification of the initiator and the stored session connection that has been established. According to the corresponding relationship between the nodes, the target controller of the new path is determined from the plurality of controllers, so that the new path is established between the server and the storage device. Through the above method, the server can automatically request the target controller, and add the path to the target controller of the storage device to the existing path, realize the dynamic management function of the path, and avoid the network failure caused by the reduction of the number of available paths due to path failure. Transmission quality degradation and other issues.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the accompanying drawings required in the embodiments. Obviously, the accompanying drawings in the following description are only some of the present invention. Embodiments, for those of ordinary skill in the art, other drawings can also be obtained according to these drawings without paying creative labor.

FIG. 1 is a schematic structural diagram of a path management system in scenario 1 provided by an embodiment of the present invention;

FIG. 2 is a schematic diagram of a path for a server to access a storage device according to an embodiment of the present invention;

FIG. 3 is a schematic diagram of another path for a server to access a storage device according to an embodiment of the present invention;

FIG. 4 is a schematic flowchart of a path management method provided by an embodiment of the present invention;

FIG. 5 is a schematic flow diagram of a path management method in a scenario 1 provided by Embodiment 1 of the present invention;

FIG. 6 is a schematic flowchart of another path management method in the scenario 1 provided by Embodiment 2 of the present invention;

FIG. 7 is a schematic flowchart of another path management method in the scenario 1 provided by Embodiment 3 of the present invention;

FIG. 8 is a schematic diagram of the system structure of Scenario 2 provided by the embodiment of the present invention;

FIG. 9 is a schematic flowchart of a path management method in scenario 2 provided by an embodiment of the present invention;

FIG. 10 is a schematic flowchart of another path management method in scenario 2 provided by an embodiment of the present invention;

FIG. 11 is a schematic flowchart of another path management method in scenario 2 provided by an embodiment of the present invention;

FIG. 12 is a schematic flowchart of another path management method provided by an embodiment of the present invention;

FIG. 13 is a schematic flowchart of another path management method provided by an embodiment of the present invention;

Fig. 14 is a schematic diagram of a hardware connection structure of a path management device provided by an embodiment of the present invention.

detailed description

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

In the prior art, the multi-path information of the server connection controller is pre-set on the server. Due to the lack of a mechanism for dynamically adjusting the path, if a path fault is removed, the server can use one less path and cannot automatically supplement another path. an available path. In extreme cases, most of the paths may be removed due to failures, making functions such as load balancing and failover automatic path switching impossible.

An embodiment of the present invention provides a path management system, including a server and a storage device, the storage device includes a scheduler and a plurality of controllers, and at least one session connection is established between the server and the storage device. The session connection forms a path between the server and the storage device, the starting node of the path corresponding to each session connection is the initiator of the server, and each session connection The target node connected to the corresponding path is the controller in the storage device. The storage device stores the corresponding relationship between the starting node and the target node of the established session connection.

In the embodiment of the present invention, the server may actively initiate the path addition operation, that is, trigger the path addition operation when it is determined that the path between the server and the storage device needs to be added;

The scheduler of the storage device receives the path addition request triggered by the server, where the path addition request carries the identifier of the initiator of the server, and the scheduler selects for the server a path that does not have a session connection with the server. The controller acts as a target controller, so that a new path is established between the server and the target controller. Specifically, the scheduler determines the target of the new path from the plurality of controllers according to the identity of the initiator and the stored correspondence between the start node and the target node of the established session connection a controller, sending the determined identifier of the target controller to the server, wherein no session connection is established between the target controller and the initiator; the server establishes a session connection according to the identifier of the target controller path to and from the target controller. Through the above method, when the server side finds that it is necessary to add a path with the storage device, it will actively initiate a path addition operation, obtain the target controller assigned by the scheduler of the storage device to the server, and establish a new path between the target controllers. path, so as to complete the path adding process, and avoid problems such as network transmission quality degradation caused by the reduction of the number of paths caused by path failures in the prior art.

Further, the server side stores multi-path information, which is used to record the path information corresponding to each established session connection between the server and the storage device, and the stored multi-path information includes information for identifying a path and path status. Wherein, the information for identifying a path includes an identifier of an initiator and an identifier of a controller, and optionally, the information for identifying a path may further include an identifier of a network card. In a specific implementation manner, the multipath information may be stored in a configuration file on the server side. It should be noted that when the path between the server and the storage device changes, the server updates the stored multipath information.

When the server side determines that a path needs to be added, it initiates a path addition operation. On the one hand, the server may determine the number of available paths in the path established with the storage device according to the above multi-path information, and initiate the path adding operation when the number of available paths is less than a preset threshold; on the other hand , the server can also send a periodic detection command to the controller that has a session connection with itself, and receive the returned A detection response message, determining that an unavailable path exists according to the detection response message, thereby initiating a path addition operation, and updating a path state corresponding to the unavailable path in the multipath information.

In a specific implementation manner, the server may initiate the path adding operation in various ways, for example:

Method 1: When the multipath management module of the server determines that the number of available paths is too small or there are unusable paths, it sends a control command to the initiator and notifies the initiator to initiate a path increase command to the storage device. When the initiator receives the control instruction, it selects any available path as the transmission channel for transmitting the path increase instruction, and when the controller of any available path receives the path increase instruction, it sends the The identifier of the initiator carried in the path addition instruction is sent to the scheduler, and the scheduler assigns the target controller of the new path to the server;

Method 2: When the multipath management module of the server determines that the number of available paths is too small or there are unusable paths, if the multipath management module of the server is directly connected to the scheduler of the storage device through the out-of-band management network, there is no need to go through the server's multipath management module. Initiator, but the multipath management module sends a path addition request to the scheduler through a dedicated switch of the out-of-band management network, the path addition request carries the initiator identifier of the server, and requests the scheduling The controller is the target controller that assigns the new path to the server.

The storage device stores the corresponding relationship between the starting node and the target node of the established session connection, and the scheduler allocates an available target controller for the server requesting a new path. When there are multiple available target controllers, the The above scheduler determines the controller with the least number of connected initiators as the target controller after screening based on the principle of load balancing. It should be noted that the correspondence between the start node and the target node stored in the storage device may adopt various specific implementation manners, for example, the correspondence is recorded in the storage device in the form of a list, that is, A controller list is recorded in the storage device, and the controller list is used to represent the corresponding relationship between the start node and the target node stored in the storage device. The controller list may include a controller ID and an initiator ID, and may further include a status of the controller.

As shown in FIG. 1 , it is a schematic structural diagram of a path management system in scenario 1 provided by an embodiment of the present invention. The server 11 accesses the storage device 12 through the switch 13 in the network, and the path management system includes A server 11, a storage device 12, and a plurality of switches 13 in the network. Wherein, the server 11 includes a multipath management module (also known as Multipath Module) 111 and a starter 113 (also known as initiator); the storage device 12 can specifically be a RAID (Redundant Arrays of independent Disks, Redundant Array of Independent Disks), The storage device 12 includes multiple controllers 121, a scheduler 122, and several storage media, for example, LUN (Logical Unit Number, logical unit number), not shown in the figure. The server 11 is connected to the switch 13 in the network through the interface of the network card (HBA, Host Bus Adapter), and further connected to the controller 121 in the storage device 12. Specifically, the initiator 113 of the server 11 communicates with the network through the HBA The switch 13 in is connected.

In the system shown in FIG. 1, the initiator 113 of the server 11 and the controller 121 of the storage device 12 establish a session connection via the network card of the server, and the starting node of the path corresponding to the session connection is the initiator 113, and the session The target node connecting the corresponding path is the controller 121 . It can be seen from the system connection schematic diagram of path management shown in FIG. 2 or FIG. 3 that the initiator 113 of the server 11 can be connected to each controller 121 of the storage device 12 through multiple paths, and the network card identification of the server 11 and the controller 121 together uniquely determine a path, as shown in Figure 2, the server can access the storage device through 4 paths, and as shown in Figure 3, the server can access the storage device through 8 paths. The network card identification of described server can be the IP address and the port of network card, and the identification of described controller comprises controller IQN (Internet Small Computer System Interface Qualified Name, Internet Small Computer System Interface Legal Name), IP address and port.

In order to make the functions of each entity in the embodiment of the present invention clear, the embodiment of the present invention introduces the functions of each entity in Figure 1 as follows:

A scheduler (Scheduler) 122 is used to manage the controller 121 and storage resources in the storage device 12. Further, each embodiment of the present invention expands the function of the scheduler 122 to provide a path allocation function and a controller State management functions;

A controller 121, configured to provide storage management and input and output control of the storage device;

The initiator 113 may specifically be an ISCSI (Internet Small Computer System Interface, Internet Small Computer System Interface) initiator, which is used to provide functions of connecting and managing with the controller 121.

The multi-path management module 111 is configured to monitor the initiator and issue operation instructions to the initiator. The multipath management module may be independent hardware or software in the server. When the multipath management module is implemented by a software module, the multipath management module 111 can realize the control function of the initiator by calling a function interface provided by the initiator. Alternatively, the multipath management module may also control the initiator through a control message.

The initiator 113 is configured to receive and execute the operation instruction issued by the multipath management module 111 .

The foregoing embodiments have basically described the path management system corresponding to scenario 1. In order to introduce a specific implementation solution more clearly, and in combination with the contents of scenario 1 above, the embodiments of the present invention provide the following path management methods.

Combined with the system architecture shown in FIG. 1 , as shown in FIG. 4 , it is a schematic flow diagram of a path management method in scenario 1 provided by an embodiment of the present invention. The path management system includes a server and a storage device, and the storage device includes a scheduling tors and multiple controllers,

Step 401: The server establishes at least one session connection with the storage device, the starting node of the path corresponding to each session connection is the initiator of the server, and the target of the path corresponding to each session connection The node is the controller in the storage device, and the storage device stores the corresponding relationship between the starting node and the target node of the established session connection;

Step 402: when it is determined that the path between the server and the storage device needs to be added, the server triggers a path addition operation;

Step 403: The scheduler receives the path addition request triggered by the server, the path addition request carries the identifier of the initiator of the server, and according to the identifier of the initiator and the stored established session The corresponding relationship between the starting node and the target node of the connection, determining the target controller of the new path from the plurality of controllers, and sending the determined identifier of the target controller to the server, wherein the No session connection is established between the target controller and the initiator;

Step 404: The server establishes a path with the target controller according to the identifier of the target controller.

An embodiment of the present invention provides a method for managing paths by a path management system. The path management system includes a server and a storage device. There is at least one session connection, when the server determines that the path between the server and the storage device needs to be added, the path addition operation is triggered, and the scheduler of the storage device is based on the identifier of the initiator and the stored established The corresponding relationship between the starting node and the target node of the session connection determines the target controller of the new path from the plurality of controllers, so that the new path is established between the server and the storage device. Through the above method, the server can automatically request the target controller, and add the path to the target controller of the storage device to the existing path, realize the dynamic management function of the path, and avoid the network failure caused by the reduction of the number of available paths due to path failure. Transmission quality degradation and other issues.

Combined with the system architecture shown in FIG. 1 , as shown in FIG. 5 , it is a schematic flowchart of a path management method in scenario 1 provided by an embodiment of the present invention. In the embodiment of the present invention, the storage device includes multiple controllers, namely controller 1 , controller 2 , controller 3 and so on, wherein controller 1 and controller 3 are connected to the initiator on the server side.

Embodiments of the invention include:

Phase 1: Connection establishment process

Step 501: The multipath management module configures multipath information on the server side, and the multipath information includes information identifying a path and path status. The information for identifying a path includes an identifier of an initiator and an identifier of a controller. Optionally, the information for identifying a path may further include an identifier of a network card. The initiator identifier includes the initiator's IQN, IP address and port, the controller identifier includes the controller IQN, IP address and port, and the network card identifier includes the network card IP address and port.

Optionally, a preset threshold for the number of available paths meeting network performance requirements may be pre-configured on the server side. When the number of available paths is less than the preset threshold, the network transmission performance cannot meet the performance requirements.

Further, the multipath information may also include the number N of paths. Wherein, the number of paths N is used to indicate the number of paths connecting the storage device to the initiator.

The server side may further include a first memory for storing a configuration file in which the multipath information is recorded.

Step 502: The scheduler configures a controller list, where the controller list is used to represent the corresponding relationship between configured controllers and servers. The controller list includes: initiator ID, controller ID, and path status. Further, the controller list may also include LUN identifiers, which are used to represent LUNs accessible by the server.

The storage device side may further include a second memory for recording the controller list on the storage device side.

Step 503: Establish a session connection between the initiator and the controller to form multiple paths between the initiator and the controller.

It should be noted that the starting node of the path corresponding to the established session connection is the initiator of the server, the target node is the controller of the storage device, and the controller list stored in the storage device is the starting node and the target node A specific implementation of the corresponding relationship between the two, those skilled in the art can understand that the storage device can use other recording methods in the prior art, which is not limited in this embodiment of the present invention.

Exemplarily, in the embodiment of the present invention, the initiator establishes a session connection with the controller 1 and the controller 3 respectively, and the specific session connection establishment can adopt a general method in the prior art, which is not limited in the embodiment of the present invention .

Phase 2: Periodic testing process. After the path connection between the initiator of the server and multiple controllers of the storage device is established, the multipath management module controls the initiator to periodically detect the established paths, including:

Step 504: The multi-path management module sends a detection start instruction to the initiator, which is used to notify the initiator to initiate periodic detection on the controller connected to the initiator;

Step 505: The initiator sends a periodic detection instruction to the controller connected to it;

Exemplarily, in the embodiment of the present invention, the initiator sends cycle detection instructions to the controller 1 and the controller 3 respectively.

Step 506: The initiator receives the detection response message returned by the controller, and determines the unavailable path according to the received detection response message;

Exemplarily, the initiator receives the detection response message returned by the controller 1, and when the detection response message is normal, the initiator determines that the path for sending the response message is normal; when the controller 3 connected to the initiator does not return the detection response message or returns an error detection response message, the initiator determines the The path of the unsent detection response message or the error detection response message connected to the controller 3 is an unavailable path, update the multipath information recorded in step 1, and set the path state corresponding to the unavailable path in the multipath information to unavailable use.

Phase 3: When a path is unavailable, the path addition process

Step 507: The multi-path management module obtains information about currently unavailable paths by monitoring the initiator;

Specifically, the multipath management module may send periodic query messages to the initiator to determine the current status of each path connected to the initiator.

Step 508: the multipath management module sends a control instruction to the initiator, and the control instruction is used to notify the initiator to initiate a path addition process;

Exemplarily, the multi-path management module learns that the status of the path connecting the initiator to the controller 3 is unavailable, and the multi-path management module sends a control instruction to the initiator, notifying the initiator to initiate a path addition process.

Step 509: The initiator sends a path addition instruction to the controller connected to it whose path state is available, and the path addition instruction includes the identifier of the initiator;

Specifically, when there are multiple available paths between the server and the storage device, the initiator may send a path addition instruction to a target node of any available path through any available path. Exemplarily, the initiator sends an ISCSI instruction to the controller 1, the ISCSI instruction is used to request to add a new path, and the specific format of the ISCIS instruction is as follows:

Key/value pairs

Keyvalue:requestnewtarget=one

It should be noted that the number of new paths requested by the path increase instruction sent by the initiator to the controller may be multiple.

Step 510: The available controller that has received the path addition instruction sends a path addition request to the scheduler, and the path addition request carries the identifier of the initiator;

Specifically, in the embodiment of the present invention, after receiving the ISCSI instruction, the controller 1 sends a path addition request to the scheduler, requesting to assign a target controller of the new path.

Step 511: the scheduler reads the list of controllers from the configuration file stored in the storage device, for all The initiator allocates a target controller (for example, controller 2), and sends the identification of the target controller to the available controller;

In the embodiment of the present invention, the scheduler is responsible for path allocation, and the scheduler may allocate paths based on path allocation algorithms such as load balancing.

When the scheduler receives a path addition request, it traverses the list of controllers, and searches for controllers that meet the following conditions according to the identifier of the initiator carried in the path addition request:

The status of the controller is normal operation;

The list of assigned initiator IDs corresponding to the controller does not contain the initiator ID requesting the path to be allocated;

The controller has the fewest number of initiators connected.

It should be noted that when there are multiple controllers satisfying the above conditions, the scheduler may randomly select any one or more of them. The scheduler adds the identifier of the initiator to the list of assigned initiator identifiers of the selected target controller, and returns the identifier of the target controller to the available controllers. On the contrary, when no qualified controller is found, the allocation fails, and the scheduler returns an allocation failure response message to the available controllers.

Step 512: The available controller sends the identifier of the target controller to the initiator in a path addition response message, where the identifier of the target controller includes the IP address and port of the target controller.

Step 513: The initiator receives the path addition response message, acquires the target controller identifier carried in the path addition response message, and sends the target controller identifier to the multipath management module;

Step 514: the multipath management module notifies the initiator to establish a session connection with the target controller;

Step 515: The initiator updates the multipath information stored on the server side, and establishes a new path between the target controllers.

It should be noted that, in the embodiment of the present invention, the target controller is used as the controller 2 for illustration. Those skilled in the art can understand that when there are multiple target controllers, the initiator can communicate with multiple target controllers. Session connections are respectively established to form multiple new paths.

In the embodiment of the present invention, when it is found that there is an unavailable path, the server side initiates a path addition process, and by carrying the identifier of the initiator in the path addition command, the scheduler on the storage device side can search and control the path according to the identifier of the initiator. The initiator list is newly assigned a target controller for the initiator, and the initiator thus establishes a session connection with the newly assigned target controller to complete the path adding process. Through the above method, the number of available paths between the server and the storage device is guaranteed. When the distributed array of the storage device expands, the newly expanded controller can be automatically used, realizing the dynamic management of the paths in the distributed storage device.

Combined with the system structure shown in FIG. 1 , as shown in FIG. 6 , it is a schematic flowchart of another method for managing a path in a path management system in the scenario 1 provided by the embodiment of the present invention. The difference from the above embodiment is that the above embodiment obtains unavailable path information through periodic detection, and the server triggers the path addition operation, while in the embodiment of the present invention, the server detects and determines the number of currently available paths, when the current path connected to the initiator Add paths when the number of available paths does not reach the system preset threshold. The connection relationship of the components in the embodiment of the present invention is the same as the connection relationship of the components in the first embodiment.

The method provided by the embodiment of the present invention includes the following steps:

Phase 1: Connection establishment process

The connection establishment process in this embodiment of the present invention is similar to that in the first embodiment, and will not be repeated in the present invention.

Phase 2: When the number of available paths is less than the preset threshold, the path increase process

Step: 604: The multipath management module monitors the initiator, and obtains the number of available paths connected to the initiator;

Specifically, the multipath management module may send a query instruction to the initiator. After receiving the query instruction, the initiator determines the number of currently available paths according to the multipath information on the server side, and calculates the number of available paths Return to the multipath management module. In another feasible implementation manner, after receiving the query instruction, the initiator returns part or all of the multipath information to the multipath management module, and the multipath management module receives the part or all of the multipath information After that, determine the number of currently available paths. Exemplarily, the initiator can send the path state in the multipath information to the multipath management module, and the multipath management module can count the number of available paths according to the path state.

In another implementation manner, the multipath management module may directly query the multipath information recorded on the server side to obtain the number of currently available paths.

Step 605: The multipath management module determines whether the number of available paths is less than a preset threshold, and if the number of available paths is less than the preset threshold, then sends a control instruction to the initiator, and the control instruction is used to notify the startup The server initiates the process of adding a path;

Step 606: The initiator sends a path adding instruction to the controller connected to it whose path status is available, and the instruction includes the identifier of the initiator;

When there are multiple available paths, the initiator may randomly select any available path to transmit the path adding instruction.

Steps 607-612 are similar to steps 510-515 in the first embodiment, and are not repeated in this embodiment of the present invention.

In the embodiment of the present invention, the server side presets the preset threshold value of available paths necessary to meet the network performance requirements, and the multipath management module obtains the number of currently available paths by monitoring the initiator. When the number of currently available paths does not reach the preset When the threshold is reached, a path increase process is initiated, thereby ensuring the number of available paths between the server and the storage device, and realizing dynamic management of paths in the distributed storage device.

Combined with the system structure shown in FIG. 1 , as shown in FIG. 7 , it is a schematic flowchart of another path management method in the scenario 1 provided by the embodiment of the present invention, including:

Phase 1: Connection establishment process

Steps 701-703 are similar to steps 501-503, and will not be repeated in this embodiment of the present invention.

Phase 2: When the controller status is found to be unavailable, the server side removes the corresponding path

Step 704: The multipath management module sends a controller status request message to the initiator, for acquiring status information of the controller connected to the initiator;

Step 705: The initiator sends a status query instruction to the controller whose connected path status is available, and the status query instruction carries the identifier of the controller connected to the initiator;

Specifically, when there are multiple controllers connected to the initiator and the path status is available, the initiator may randomly select any available path for transmitting the state query instruction.

Step 706: The available controller that has received the status query instruction sends a status query message to the scheduler, where the status query message includes the identifier of the controller connected to the initiator.

Step 707: The scheduler queries the controller list, obtains the state information of the controller connected to the initiator according to the identifier of the controller connected to the initiator, and connects the obtained controller to the initiator The status information of the controllers is returned to the available controllers;

Step 708: The available controller returns the state information of the controller connected to the initiator to the multipath management module through the initiator;

Step 709: The multipath management module sends an update instruction to the initiator, notifying the initiator to update the multipath information, so as to delete the path corresponding to the controller whose status is unavailable. Since the controller identifier is recorded in the multipath information stored on the server side, paths related to unavailable controllers can be identified and deleted.

In the embodiment of the present invention, the multipath management module controls the initiator, queries the scheduler for the status information of the controller connected to the initiator through any available path, and obtains the status of the controller connected to the initiator from the scheduler information to identify unavailable controllers and delete paths corresponding to unavailable controllers. That is, when the capacity of the distributed array of storage devices is reduced, the server can automatically remove controllers that no longer exist.

As shown in FIG. 8 , it is a schematic diagram of the system structure of Scenario 2 provided by the embodiment of the present invention. The difference from Scenario 1 is that in the embodiment of the present directly connected to the scheduler, that is, the multipath management module is connected to the scheduler through a dedicated switch in the management network. The multi-path management module can directly initiate a path addition process to the scheduler, or obtain the status of the controller connected to the initiator of the server from the scheduler.

Combined with the system architecture shown in FIG. 8 , as shown in FIG. 9 , the embodiment of the present invention provides a schematic flowchart of a path management method in scenario 2, and introduces the process of adding a path when there is an unavailable path. Wherein, for example, the initiator is connected to the controller 1 and the controller 3, and the multipath management module is connected to the scheduler on the storage device side through a dedicated switch. It should be noted that the private switch is only an implementation solution of an out-of-band connection given in the embodiment of the present invention, and those skilled in the art can understand that, The out-of-band connection between the multipath management module and the scheduler may also be implemented in other ways, which is not limited in this embodiment of the present invention.

Embodiments of the invention include:

Phase 1: Connection establishment process.

Phase 2: Periodic testing process.

Steps 901 to 906 are executed in a similar manner to steps 501 to 506, which are not repeated in this embodiment of the present invention.

Phase 3: When a path is unavailable, the path addition process

Step 907: The multi-path management module obtains information about currently unavailable paths by monitoring the initiator;

Specifically, the multipath management module may send periodic query messages to the initiator to determine the current status of each path connected to the initiator.

Step 908: The multi-path management module obtains the information of the unavailable path, and sends a path addition request to the scheduler, and the path addition request carries the identifier of the initiator;

Exemplarily, the multi-path management module may obtain a message returned by the initiator according to the multi-path information by monitoring the initiator, and learn that the state of the path connecting the initiator to the controller 3 is unavailable.

Step 909: the scheduler reads the list of controllers from the configuration file stored in the storage device, and sends the identifier of the target controller in the path addition response according to the identifier of the initiator as the target controller of the initiator's new path to the multipath management module.

Specifically, the scheduler allocates a new controller to the initiator according to the current state and load of the controller. The specific allocation method is similar to step 511, and will not be repeated in this embodiment of the present invention. Exemplarily, the embodiment of the present invention takes the controller 2 as an example for illustration. The scheduler selects the controller 2 as the target controller of the new path assigned to the initiator according to the path assignment algorithm, and returns the identifier of the controller 2 to the The multipath management module.

Step 910: the multipath management module sends the identifier of the newly assigned target controller to the initiator, and notifies the initiator to establish a session connection with the target controller;

Step 911: The initiator updates the multipath information stored on the server side, and will communicate with the target controller The information of the path between them is added to the multipath information, and a new path between the target controllers is established.

In the embodiment of the present invention, the multipath management module of the server is connected to the scheduler of the storage device through a dedicated switch of the out-of-band management network. The identifier of the initiator, so that the scheduler on the storage device side can search the controller list according to the identifier of the initiator, and assign a new target controller to the initiator, so that the initiator can establish a new target controller with the newly assigned target controller. path. Through the above method, the number of available paths between the server and the storage device is guaranteed. When the distributed array of the storage device expands, the newly expanded controller can be automatically used, realizing the dynamic management of the paths in the distributed storage device.

Combined with the system architecture shown in FIG. 8 , as shown in FIG. 10 , the embodiment of the present invention provides a schematic flowchart of another path management method in scenario 2, and introduces when the initiator and the controller of the storage device Path addition process when the number of available paths is less than the preset threshold.

Embodiments of the invention include:

Phase 1: Connection establishment process.

Step 1001-1003 connection establishment process is similar to steps 501-503;

Phase 2: When the number of available paths is less than the preset threshold, the path increase process

Step 1004: The multipath management module monitors the initiator, and obtains the number of available paths connected to the initiator;

Specifically, the multipath management module may send a query instruction to the initiator. After receiving the query instruction, the initiator determines the number of currently available paths according to the multipath information on the server side, and calculates the number of available paths Return to the multipath management module. In another feasible implementation manner, after receiving the query instruction, the initiator returns part or all of the multipath information to the multipath management module, and the multipath management module receives the part or all of the multipath information After that, determine the number of currently available paths. Exemplarily, the initiator can send the path state in the multipath information to the multipath management module, and the multipath management module can count the number of available paths according to the path state.

In another implementation, the multipath management module can query the multipath information to obtain the currently available Use the number of paths.

Step 1005: The multipath management module determines whether the number of available paths is less than a preset threshold, and if the number of available paths is less than the preset threshold, sends a path increase to the scheduler of the storage device through a dedicated switch in the management network. request, the path addition request carries the identifier of the initiator;

Steps 1006 - 1008 are similar to steps 909 - 911 , and will not be repeated in this embodiment of the present invention.

In the embodiment of the present invention, the server side presets the preset threshold value of available paths necessary to meet the network performance requirements, and the multipath management module obtains the number of currently available paths by monitoring the initiator. When the number of currently available paths does not reach the preset When the threshold value is reached, a path adding process is initiated to add a new path, thereby ensuring the number of available paths between the server and the storage device, and realizing dynamic management of paths in the distributed storage device.

Combined with the system architecture shown in FIG. 8 , as shown in FIG. 11 , the embodiment of the present invention provides a schematic flowchart of another path management method in Scenario 2, including:

Phase 1: Connection establishment process

Step 1101-1103 connection establishment process is similar to steps 501-503;

Phase 2: When the controller status is found to be unavailable, the server side removes the corresponding path

Step 1104: The multi-path management module sends a status request message to the scheduler through a dedicated switch to obtain status information of the controller connected to the initiator, and the status request message carries the status information of the controller connected to the initiator. logo;

Step 1105: The scheduler queries the controller list, obtains the status information of the controller connected to the initiator according to the identifier of the controller connected to the initiator, and uses the acquired The status information of the controller connected to the controller is returned to the multipath management module;

Step 1106: The multi-path management module sends an update command to the initiator, the update command carries the acquired status information of the controller connected to the initiator, and notifies the initiator to The status information of the connected controllers updates the multipath information, and deletes the paths corresponding to the unavailable controllers.

In the embodiment of the present invention, the multi-path management module acquires and activates the Status information of connected controllers, so as to identify unavailable controllers, and control the initiator to delete paths corresponding to unavailable controllers. That is, when the capacity of the distributed array of storage devices is reduced, the server can automatically remove controllers that no longer exist.

It should be noted that, in the above-mentioned embodiments of the present invention, the newly added target controller can be one controller or multiple controllers. When the number of currently available paths is small, the scheduler can return multiple target controllers at a time IDs of the controllers, so that multiple new paths are established between the initiator and the multiple target controllers.

As shown in FIG. 12 , it is a schematic flowchart of another path management method provided by an embodiment of the present invention. A path management method is applied to a path management system. The path management system includes a server and a storage device. The storage The device includes a plurality of controllers and a scheduler, the method includes:

Step 1201: At least one controller among the plurality of controllers establishes a session connection with the server, the starting node of the path corresponding to the session connection is the initiator of the server, and the path corresponding to the session connection The target node is the controller in the storage device, and the storage device stores the corresponding relationship between the starting node and the target node of the established session connection;

Step 1202: The scheduler receives a path addition request triggered by the server, the path addition request carries the identifier of the initiator of the server, and according to the identifier of the initiator and the stored established session The corresponding relationship between the starting node and the target node of the connection, determining the target controller of the new path from the plurality of controllers, and sending the determined identifier of the target controller to the server, wherein the No session connection is established between the target controller and the initiator;

Step 1203: The target controller establishes a new path with the initiator of the server.

Further, when there are multiple target controllers for the determined new path, the method further includes:

The scheduler determines at least one target controller meeting the following condition from among the multiple target controllers: the number of initiators connected to the controller is the smallest.

The method also includes:

At least one controller among the plurality of controllers receives a status query instruction sent by the server, and sends a status query message to the scheduler, and the status query message carries information that there is a session connection with the initiator of the server ID of the controller;

The scheduler receives the status query message, acquires the status information of the controller that has a session connection with the initiator of the server, and uses the obtained status information of the controller that has a session connection with the initiator of the server The status information is returned to the server through the target node of any available path, so that the server deletes the path corresponding to the unavailable controller in the recorded multipath information.

As shown in FIG. 13, another path management method provided by the embodiment of the present invention is applied to a path management system, the path management system includes a server and a storage device, and the server includes a multipath management module and an initiator. The storage device includes a scheduler and a plurality of controllers, wherein at least one session connection exists between the initiator of the server and the plurality of controllers of the storage device, and each session connection corresponds to a starting node of a path is the initiator of the server, the target node of the path corresponding to each session connection is the controller in the storage device, and the storage device stores the established session connection between the start node and the target node corresponding relationship,

Step 1301: The initiator receives the control instruction sent by the multipath management module when it determines that the path between the server and the storage device needs to be increased, and the control instruction is used to notify the initiator to execute the path increase operate;

Step 1302: The initiator sends a path addition command to the target node of the any available path through any available path, the path addition command carries the identifier of the initiator, and the path addition command is used to notify the any available path The target node of the path sends a path addition request to the scheduler, so that the scheduler, according to the identifier of the initiator and the stored correspondence between the start node and the target node of the established session connection, determining a target controller of a new path from the plurality of controllers, wherein no session connection is established between the target controller and the initiator;

Step 1303: The server establishes a path with the target controller according to the identifier of the target controller.

Corresponding to the foregoing method embodiments, the embodiment of the present invention also provides a server, including a multipath management module and an initiator,

The initiator is used to establish at least one session connection with the storage device, the starting node of the path corresponding to each session connection is the initiator of the server, and the target node of the path corresponding to each session connection is the the controller in the storage device;

A multipath management module, configured to trigger a path addition operation when it is determined that the path between the server and the storage device needs to be added, so that the scheduler of the storage device Establishing a corresponding relationship between the starting node and the target node of the session connection, determining the target controller of the new path from the plurality of controllers of the storage device;

The initiator is further configured to establish a path between the target controllers according to the identifiers of the target controllers sent by the storage device.

The storage device stores the corresponding relationship between the starting node and the target node of the established session connection, and the scheduler of the storage device assigns the server to the server according to the corresponding relationship and the identifier of the initiator. A target controller that allocates a new path, and no session connection is established between the target controller and the initiator.

Wherein, the server side stores multi-path information, and the multi-path information includes information for identifying a path and a state of the path.

The multipath management module is further configured to determine the number of currently available paths according to the multipath information, and when the number of available paths is less than a preset threshold, it is determined that it is necessary to increase the number of paths between the server and the storage device. path between.

The initiator is further configured to send a periodic detection instruction to the controller having a session connection with itself, receive a returned detection response message, determine an unavailable path according to the detection response message, and update the unavailable path in the multipath information. The path state corresponding to the path.

The multipath management module is specifically configured to send a control instruction for initiating a path addition operation to the initiator;

The initiator is specifically configured to send a path addition instruction to a target node of any available path according to the control instruction, where the path addition instruction carries an identifier of the initiator.

The initiator is further configured to receive the controller status request message sent by the multipath management module, and send a status query instruction to the target node of the any available path through any available path, and the status query instruction carries the the identity of the controller to which the said initiator has a session connection;

The initiator is further configured to receive the status information of the controller that has a session connection with the initiator of the server returned by the scheduler through any available path, and delete the recorded multipath information The path corresponding to the unavailable controller in the information, wherein the information identifying the path includes a controller identifier.

The multipath management module is specifically configured to send a path addition request to the scheduler of the storage device through a dedicated switch, where the path addition request carries the identifier of the initiator;

The multipath management module is further configured to receive the identifier of the target controller returned by the scheduler, and notify the initiator to establish a new path with the target controller.

The multipath management module is further configured to send a status query message to the scheduler of the storage device through a dedicated switch, where the status query message carries an identifier of a controller that has a session connection with the initiator;

The multi-path management module is further configured to receive the status information of the controller that has a session connection with the initiator returned by the scheduler, and delete the path corresponding to the unavailable controller in the recorded multi-path information, wherein , the information identifying the path includes a controller identifier.

The embodiment of the present invention also provides a storage device, the storage device includes multiple controllers and schedulers,

At least one of the plurality of controllers is configured to establish a session connection with the server, the starting node of the path corresponding to the session connection is the initiator of the server, and the target node of the path corresponding to the session connection It is the controller in the storage device, and the storage device stores the corresponding relationship between the starting node and the target node of the established session connection;

The scheduler is configured to receive a path addition request triggered by the server, where the path addition request carries an identifier of an initiator of the server, and according to the identifier of the initiator and the stored established session The corresponding relationship between the starting node and the target node of the connection, determining the target controller of the new path from the plurality of controllers, and sending the determined identifier of the target controller to the server, wherein the No session connection is established between the target controller and the initiator;

The target controller is configured to establish a new path with the initiator of the server.

When the determined target controllers of the new path are multiple,

The scheduler is also used to determine at least one target controller that meets the following conditions from multiple target controllers:

The controller has the fewest number of initiators connected.

The scheduler is further configured to receive a status query message triggered by the server, where the status query message carries an identifier of a controller that has a session connection with the initiator of the server;

The scheduler is further configured to obtain the state information of the controller having a session connection with the initiator of the server according to the identifier of the controller having a session connection with the initiator of the server, and the acquired state information returned to the server.

The scheduler is specifically configured to receive the status query message sent by the server through the target node of any available path, and pass the status information of the controller having a session connection with the initiator of the server through the arbitrary available path The target node of is returned to the server; or,

The scheduler is specifically configured to receive the status query message sent by the multi-path management module of the server through the dedicated switch, and pass the status information of the controller having a session connection with the initiator of the server through the dedicated switch returned to the server.

Embodiments of the present invention provide a path management system, device, and method. The path management system includes a server and a storage device. There is at least one session connection between the initiator of the server and multiple controllers of the storage device. When it is determined that the path between the server and the storage device needs to be increased, a path addition operation is triggered, and the scheduler of the storage device connects the starting node and the target according to the identification of the initiator and the stored session connection that has been established. According to the corresponding relationship between the nodes, the target controller of the new path is determined from the plurality of controllers, so that the new path is established between the server and the storage device. Through the above method, the server can automatically request the target controller, and add the path to the target controller of the storage device to the existing path, realize the dynamic management function of the path, and avoid the network failure caused by the reduction of the number of available paths due to path failure. Transmission quality degradation and other issues.

Further, as shown in FIG. 14 , an embodiment of the present invention provides a schematic diagram of a hardware configuration of a server or a storage device. In a specific product implementation, the server or storage device includes at least one processor (such as CPU), at least one network interface or other communication interface, memory, and at least one communication bus, which are used to implement the components of the above-mentioned embodiments. communication between connections. The processor is used to execute the executable module stored in the memory, and realize the functions of the multipath management module, the initiator, the controller, and the scheduler in the above-mentioned embodiments. The memory may include high-speed random access memory (RAM: Random Access Memory), and may also include non-volatile memory (non-volatile memory), such as at least one disk storage. The communication connection between the system gateway and at least one other network element is realized through at least one network interface (which may be wired or wireless), and the Internet, wide area network, local network, metropolitan area network, etc. can be used.

In some implementations, program instructions are stored in the computer-readable medium, including computer-executable instructions, so that when the processor of the computer executes the computer-executable instructions, the computer executes the method described in any one of the above-mentioned embodiments. Method of path management. Wherein, the program instructions may include the components mentioned in the above-mentioned embodiments of the present invention, and the specific implementation manner of each component may refer to the corresponding content in the above-mentioned embodiments of the present invention, which will not be repeated here.

From the above description of the implementation manners, it can be seen that those skilled in the art can clearly understand that all or part of the steps in the methods of the above embodiments can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the essence of the technical solution of the present invention or the part that contributes to the prior art can be embodied in the form of software products, and the computer software products can be stored in storage media, such as ROM/RAM, disk , optical disc, etc., including several instructions to make a computer device (which may be a personal computer, a resource management server, or a network communication device such as a media gateway, etc.) execute various embodiments of the present invention or some parts of the embodiments described method.

It should be noted that each embodiment in this specification is described in a progressive manner, the same and similar parts of each embodiment can be referred to each other, and each embodiment focuses on the differences from other embodiments. place. In particular, for the device and system embodiments, since they are basically similar to the method embodiments, the description is relatively simple, and for relevant parts, please refer to part of the description of the method embodiments. The device and system embodiments described above are only illustrative, and the units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in One place, or it can be distributed to multiple network elements. Part or all of the modules can be selected according to actual needs to achieve the purpose of the solution of this embodiment. It can be understood and implemented by those skilled in the art without creative effort.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present invention are included in the protection scope of the present invention.

Claims (38)

1. A kind of system of path management, it is characterized in that, including server and storage device, the storage device includes scheduler and multiple controllers, at least one session connection is set up between the server and the storage device, the start node in each corresponding path of session connection is the starter of the server, the destination node in the corresponding path of each session connection is the controller in the storage device, the corresponding relation between the start node and destination node for the session connection having built up is stored in the storage device

   The server, for when it is determined that needing to increase the path between the server and the storage device, the increase of triggering path to be operated；

   The scheduler, request is increased by the path of the server triggers for receiving, the mark of the starter of the server is carried in the path increase request, corresponding relation between the start node and destination node of the session connection being had built up according to the mark of the starter and storage, the target controller of new route is determined from the multiple controller, the mark of the target controller of determination is sent to the server, wherein, session connection is not set up between the target controller and the starter；

   The server, is additionally operable to the path set up according to the mark of the target controller between the target controller.
2. The system as claimed in claim 1, it is characterised in that server side is stored with multipath information, the multipath information includes the information and path status for identification path.
3. System as claimed in claim 1 or 2, it is characterised in that when the target controller of the new route of the determination is multiple,

   The scheduler, is additionally operable to be determined for compliance with least one target controller of following condition from the multiple target controller：

   The starter minimum number of controller connection.
4. System as claimed in claim 2, it is characterised in that

   The server, is additionally operable to, according to the multipath information, determine currently available number of passes, when the available path bar number is less than predetermined threshold value, it is determined that need to increase the path between the server and the storage device.
5. System as described in claim 2-4 is any, it is characterised in that

   The server, it is additionally operable to by any available path, status inquiry instruction is sent to the destination node of any available path, to cause the destination node of any available path to the scheduler dispatches STATUS ENQUIRY message, there is the mark of the controller of session connection in the starter carried in the STATUS ENQUIRY message with the server；

   The scheduler, it is additionally operable to receive the STATUS ENQUIRY message, there is the status information of the controller of session connection in the starter obtained with the server, the status information that there is the controller of session connection described in acquisition with the starter of the server is returned into the server by the destination node of any available path；

   The server, it is additionally operable to the status information of controller that session connection is had according to the described and server starter received, the corresponding path of unavailable controller in the multipath information of deletion record, wherein, the information of the identification path includes controller identifier.
6. System as described in claim 2-5 is any, it is characterised in that

   The server, it is additionally operable to be periodically detected instruction to itself there is the transmission of the controller of session connection, the detection response message returned is received, unavailable path is determined according to the detection response message, the corresponding path status in unavailable path in the multipath information is updated.
7. System as described in claim 1-6 is any, it is characterised in that

   The server, is instructed specifically for increasing to the destination node transmitting path of any available path, is asked with triggering path increase described in the destination node to the scheduler dispatches of any available path.
8. System as described in claim 1-6 is any, it is characterised in that

   The server, is asked specifically for triggering the path increase, and is asked by path increase described in private branch exchange system to the scheduler dispatches, receives the mark for the target controller that the scheduler is returned by the private branch exchange system.
9. System as described in claim 2-6 is any, it is characterised in that

   The server, is additionally operable to by private branch exchange system to the scheduler dispatches status query request, and the starter carried in the status query request with the server has the mark of the controller of session connection Know；

   The scheduler, it is additionally operable to receive the STATUS ENQUIRY message, obtain the status information that the starter with the server has the controller of session connection, the status information of the controller that there is session connection with server starter is returned into the server by the private branch exchange system, the corresponding path of unavailable controller in the multipath information to cause the server deletion record, wherein, the information of the identification path includes controller identifier.
10. System as claimed in claim 2, it is characterised in that the multipath information is stored in the configuration file of server side.
11. A kind of server, it is characterised in that including multi-route management module and starter,

    Starter, for at least one session connection between foundation and storage device, the start node in each corresponding path of session connection is the starter of the server, and the destination node in the corresponding path of each session connection is the controller in the storage device；

    Multi-route management module, for when it is determined that needing to increase the path between the server and the storage device, trigger path increase operation, to cause the scheduler of the storage device that according to the corresponding relation between the mark of the starter and the start node and destination node of the session connection having built up of storage, the target controller of new route is determined from multiple controllers of the storage device；

    The starter, is additionally operable to the path built on according to the mark of the target controller of storage device transmission between the target controller.
12. Server as claimed in claim 11, it is characterised in that server side is stored with multipath information, the multipath information includes the information and path status for identification path.
13. Server as claimed in claim 12, it is characterised in that

    The multi-route management module, is additionally operable to, according to the multipath information, determine currently available number of passes, when the available path bar number is less than predetermined threshold value, it is determined that need to increase the path between the server and the storage device.
14. Server as described in claim 12-13 is any, it is characterised in that

    The starter, it is additionally operable to be periodically detected instruction to itself there is the transmission of the controller of session connection, the detection response message returned is received, unavailable path is determined according to the detection response message, the corresponding path status in unavailable path in the multipath information is updated.
15. Server as described in claim 12-14 is any, it is characterised in that

    The multi-route management module, specifically for sending the control instruction for initiating path increase operation to the starter；

    The starter, specifically for according to the control instruction, increasing to the destination node transmitting path of any available path and instructing, the path increase instruction carries the mark of the starter.
16. Server as described in claim 12-15, it is characterised in that

    The starter, it is additionally operable to receive the controller state request message that the multi-route management module is sent, pass through any available path, status inquiry instruction is sent to the destination node of any available path, the status inquiry instruction carries the mark for the controller that there is session connection with the starter；

    The starter, it is additionally operable to receive the status information of the scheduler returned by any available path controller that there is session connection with server starter, the corresponding path of unavailable controller in the multipath information of deletion record, wherein, the information of the identification path includes controller identifier.
17. Server as described in claim 11-14 is any, it is characterised in that

    The multi-route management module, is asked specifically for being increased by private branch exchange system to the scheduler dispatches path of the storage device, and the path increase request carries the mark of the starter；

    The multi-route management module, is additionally operable to receive the mark for the target controller that the scheduler is returned, the new route for notifying the starter to set up between the target controller.
18. Server as described in claim 11-14, it is characterised in that

    The multi-route management module, is additionally operable to the scheduler dispatches STATUS ENQUIRY message to the storage device by private branch exchange system, and the STATUS ENQUIRY message carries the mark for the controller that there is session connection with the starter；

    The multi-route management module, is additionally operable to receive unavailable controller correspondence in the status information for the controller that there is session connection with the starter that the scheduler is returned, the multipath information of deletion record Path, wherein, the information of the identification path includes controller identifier.
19. Server as claimed in claim 12, it is characterised in that the multipath information is stored in the configuration file of server side.
20. A kind of storage device, it is characterised in that the storage device includes multiple controllers and scheduler,

    At least one controller in the multiple controller, for setting up session connection between server, the start node in the corresponding path of the session connection is the starter of server, the destination node in the corresponding path of the session connection is the corresponding relation between the start node and destination node that the session connection having built up is stored in the controller in the storage device, the storage device；

    The scheduler, request is increased by the path of the server triggers for receiving, the mark of the starter of the server is carried in the path increase request, corresponding relation between the start node and destination node of the session connection being had built up according to the mark of the starter and storage, the target controller of new route is determined from the multiple controller, the mark of the target controller of determination is sent to the server, wherein, session connection is not set up between the target controller and the starter；

    The target controller, for setting up the new route between the starter of the server.
21. Storage device as claimed in claim 20, it is characterised in that when it is determined that the new route target controller for it is multiple when,

    The scheduler, is additionally operable to be determined for compliance with least one target controller of following condition from multiple target controllers：

    The starter minimum number of controller connection.
22. Storage device as described in claim 20 or 21, it is characterised in that

    The scheduler, is additionally operable to receive the STATUS ENQUIRY message by the server triggers, and the starter carried in the STATUS ENQUIRY message with the server has the mark of the controller of session connection；

    The scheduler, the mark for the controller for being additionally operable to there is session connection according to the starter with the server obtains the status information for the controller that there is session connection with the starter of the server, and the status information got is returned into the server.
23. Storage device as claimed in claim 22, its feature is being,

    The scheduler, specifically for receiving the STATUS ENQUIRY message that the server is sent by the destination node of any available path, the status information that the starter with the server is existed to the controller of session connection returns to the server by the destination node of any available path；Or,

    The scheduler, specifically for receiving the STATUS ENQUIRY message that the multi-route management module of the server is sent by private branch exchange system, the status information that the starter with the server is existed to the controller of session connection returns to the server by the private branch exchange system.
24. A kind of method of path management, it is characterised in that applied to path management system, the path management system includes server and storage device, and the storage device includes scheduler and multiple controllers,

    At least one session connection that the server is set up between the storage device, the start node in each corresponding path of session connection is the starter of the server, the destination node in the corresponding path of each session connection is the corresponding relation between the start node and destination node that the session connection having built up is stored in the controller in the storage device, the storage device；

    When it is determined that needing to increase the path between the server and the storage device, the server triggers path increase operation；

    The scheduler is received to be increased by the path of the server triggers and asked, the mark of the starter of the server is carried in the path increase request, corresponding relation between the start node and destination node of the session connection being had built up according to the mark of the starter and storage, the target controller of new route is determined from the multiple controller, the mark of the target controller of determination is sent to the server, wherein, session connection is not set up between the target controller and the starter；

    The path that the server is set up between the target controller according to the mark of the target controller.
25. Method as claimed in claim 24, it is characterised in that server side is stored with multipath information, the multipath information includes the information and path status for identification path.
26. Method as described in claim 24 or 25, it is characterised in that when the new route of the determination Target controller for it is multiple when, methods described also includes：

    The scheduler is determined for compliance with least one target controller of following condition from the multiple target controller：

    The starter minimum number of controller connection.
27. Method as described in claim 25 or 26, it is characterised in that methods described also includes：

    The server determines currently available number of passes according to the multipath information, when the available path bar number is less than predetermined threshold value, it is determined that need to increase the path between the server and the storage device.
28. Method as described in claim 25-27 is any, it is characterised in that methods described also includes：

    The server passes through any available path, status inquiry instruction is sent to the destination node of any available path, to cause the destination node of the available path to the scheduler dispatches STATUS ENQUIRY message, there is the mark of the controller of session connection in the starter carried in the STATUS ENQUIRY message with the server；

    The scheduler receives the STATUS ENQUIRY message, the status information that the starter with the server has the controller of session connection is obtained, the status information that there is the controller of session connection described in acquisition with the starter of the server is returned into the server by the destination node of any available path；

    There is the status information of the controller of session connection according to the described and server starter received in the server, the corresponding path of unavailable controller in the multipath information of deletion record, wherein, the information of the identification path includes controller identifier.
29. Method as described in claim 25-28 is any, it is characterised in that methods described also includes：

    The server is periodically detected instruction to sending with itself there is the controller of session connection, receives the detection response message returned, and the corresponding path status in unavailable path in unavailable path, the renewal multipath information is determined according to the detection response message.
30. Method as described in claim 24-29, it is characterised in that the triggering path increase operation includes：

    The server increases to the destination node transmitting path of any available path to be instructed, and is asked with triggering path increase described in the destination node to the scheduler dispatches of any available path.
31. Method as described in claim 24-27, it is characterised in that the triggering path increase operation includes：

    The server is asked by path increase described in private branch exchange system to the scheduler dispatches.
32. Method as described in claim 24-27, it is characterised in that methods described also includes：

    The server is by private branch exchange system to the scheduler dispatches status query request, and the starter carried in the status query request with the server has the mark of the controller of session connection；

    The scheduler receives the STATUS ENQUIRY message, obtain the status information that the starter with the server has the controller of session connection, the status information of the controller that there is session connection with server starter is returned into the server by the private branch exchange system, the corresponding path of unavailable controller in the multipath information to cause the server deletion record, wherein, the information of the identification path includes controller identifier.
33. A kind of method of path management, it is characterised in that applied to path management system, the path management system includes server and storage device, and the storage device includes multiple controllers and scheduler, and methods described includes：

    Session connection is set up between at least one controller and the server in the multiple controller, the start node in the corresponding path of the session connection is the starter of server, the destination node in the corresponding path of the session connection is the corresponding relation between the start node and destination node that the session connection having built up is stored in the controller in the storage device, the storage device；

    The scheduler is received to be increased by the path of the server triggers and asked, the mark of the starter of the server is carried in the path increase request, corresponding relation between the start node and destination node of the session connection being had built up according to the mark of the starter and storage, the target controller of new route is determined from the multiple controller, the mark of the target controller of determination is sent to the server, wherein, session connection is not set up between the target controller and the starter；

    The new route that the target controller is set up between the starter of the server.
34. Method as claimed in claim 33, it is characterised in that when the target controller of the new route of the determination is multiple, methods described also includes：

    The scheduler is determined for compliance with least one target controller of following condition from multiple target controllers：

    The starter minimum number of controller connection.
35. Method as claimed in claim 33, it is characterised in that methods described also includes：

    At least one controller in the multiple controller receives the status inquiry instruction that the server is sent, to the scheduler dispatches STATUS ENQUIRY message, there is the mark of the controller of session connection in the starter carried in the STATUS ENQUIRY message with the server；

    The scheduler receives the STATUS ENQUIRY message, obtain the status information that the starter with the server has the controller of session connection, the status information that there is the controller of session connection described in acquisition with the starter of the server is returned into the server by the destination node of any available path, the corresponding path of unavailable controller in the multipath information to cause the server deletion record.
36. A kind of method of path management, it is characterized in that, applied to path management system, the path management system includes server and storage device, the server includes multi-route management module and starter, the storage device includes scheduler and multiple controllers, wherein, there is at least one session connection between the starter of the server and multiple controllers of the storage device, the start node in each corresponding path of session connection is the starter of the server, the destination node in the corresponding path of each session connection is the controller in the storage device, the corresponding relation between the start node and destination node for the session connection having built up is stored in the storage device,

    The starter receives the control instruction that the multi-route management module is sent when it is determined that needing and increasing the path between the server and the storage device, and the control instruction is used to notify the starter execution route increase operation；

    The starter is increased by any available path to the destination node transmitting path of any available path to be instructed, and the path increase instruction carries the mark of the starter, and the path increase instruction is used to lead to Know that the destination node of any available path increases to the scheduler dispatches path to ask, the corresponding relation between start node and destination node to cause session connection that the scheduler has built up according to the mark of the starter and storage, the target controller of new route is determined from the multiple controller, wherein, session connection is not set up between the target controller and the starter；；

    The path that the server is set up between the target controller according to the mark of the target controller.
37. A kind of device of path management, it is characterised in that described device includes processor, memory, bus and communication interface；

    The memory is used to store computer executed instructions, the processor is connected with the memory by the bus, when the plant running of the path management, the computer executed instructions of memory storage described in the computing device, so that the method that the device of the path management performs the path management as described in any in claim 24-36.
38. A kind of computer-readable medium, it is characterised in that including computer executed instructions, for described in the computing device of computer during computer executed instructions, the method that the computer performs the path management as described in any in claim 24-36.