JP2002157091A - Storage subsystem and storage device used in the system - Google Patents

Abstract

(57) Abstract: In a physical storage device, an occupation time of a logical storage area is obtained, and I / O to the physical storage device with higher accuracy is obtained.
Get access occupation time information for each. SOLUTION: A table 225 for storing information related to an access request from a host in a physical storage area control device 22 on each physical storage device 15, a table 227 for counting the occupation time related to access, and a disk array configuration Of the logical storage area and the classification information from the disk array controller 13 and request the configuration information and the classification information of the logical storage area to the disk array controller as needed. A data processing control unit 224 is provided. Further, the disk array control device 13 is provided with means for transmitting the current configuration information of the disk array to the physical storage area control device in response to a request from the physical storage area control device on the physical storage device.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a storage subsystem and a storage device used for the system, and more particularly, to a storage subsystem having a plurality of storage devices and a storage device used for the system.

[0002]

2. Description of the Related Art A disk array system is known as a high-performance secondary storage system used in a computer system.

In a disk array system, a plurality of physical storage devices are arranged in an array, data is divided and stored in each physical storage device, and each of the physical storage devices is operated in parallel to store each of the physical storage devices. This is a system that enables high-speed reading / writing of data divided and stored in a storage device.

[0004] As a prior art relating to a disk array system, for example, DAPatterson, G. Gibson, and RHK
ats, “A Case for Redundant Arrays of Inexpensive D
isks (disk array) ”(in Proc. ACM SIGMOD, pp.
109-116, June 1988). In this prior art, a type of level 1 to level 5 is given to a disk array system to which redundancy has been added according to the configuration. In addition, a disk array system without redundancy is added to these types, and this is sometimes referred to as level 0. Each of the above levels is implemented as a different configuration depending on redundancy etc.
Cost and performance characteristics are different. When constructing a disk array system, a plurality of levels of arrays (sets of physical storage devices) are often mixed. Here, a set of disk arrays to which redundancy has been added is called a parity group. In addition, the cost of a physical storage device differs depending on the performance, capacity, and the like, and a plurality of types of physical storage devices having different performances and capacities may be used in order to achieve optimal cost performance when constructing a disk array system. .

[0005] Data stored in the disk array system is distributed and arranged in the physical storage device as described above. For this reason, the disk array system needs to perform correspondence between the logical storage area accessed by the host computer connected to the disk array system and the physical storage area indicating the storage area of the physical storage device, that is, address conversion.

As a prior art relating to a disk array system for performing address conversion processing, for example, Japanese Patent Laid-Open No.
A technique described in 274544 is known. This prior art is based on a means for acquiring information on I / O access to a logical storage area from a host computer and a means for performing physical relocation by changing the association of a logical storage area with a physical storage area. This publication discloses a technique in which a disk array controller acquires I / O access occupation time information on a logical storage area by an optimal arrangement of stored data.

The information of the occupation time of the I / O access to the logical storage area is used when the physical relocation is performed by changing the association of the logical storage area with the physical storage area in order to distribute the load of the disk array system. In addition, it is important because it becomes the original data.

[0008]

In the prior art described in the above publication, the disk array controller acquires the occupation time of the logical storage area by I / O. The proposed method has the following problems.

First, consider a case where data is written to a certain logical storage area. In this case, data is written to the physical storage area corresponding to the logical storage area. The physical storage area is in the physical storage device,
The physical storage device mainly includes a physical storage area control unit, a cache memory for caching data, and a physical storage area. When writing data to the physical storage area, a write completion response is notified to the disk array controller when the physical storage area control unit writes the write data to the cache. For this reason, the above-mentioned conventional technique has a problem that it is impossible to determine the time of accessing the physical storage area for actually writing data.

Next, consider the case where data is read from a certain logical storage area. In this case, the data in the physical storage area corresponding to the logical storage area is read. However, when the read data is actually stored in the cache memory in the physical storage device, the physical storage area is not accessed. Access to the cache memory
Returns that data. For this reason, the above-mentioned prior art has a problem that it is not possible to determine whether or not the physical storage area is actually accessed for data read, and that the exact time of accessing the physical storage area is not known. Will have.

Further, consider a case where a logical storage area such as A, B, C and D is accessed a plurality of times. The response of A is A ', the response of B is B', etc., the time of access A is A (t), the time of access B is B (t),
The time of the response A 'is assumed to be A' (t) or the like. Here, the access A reads the data by accessing the physical storage device by the data read, and the access B receives the response B 'without accessing the physical storage device because the data is in the cache by the data read. Suppose in this case,
The response B 'of the access B that comes later is earlier than the response A' of the access A that was earlier. That is, A (t)
<B (t), A ′ (t)> B ′ (t). At this time, the conventional technique of acquiring the occupation time of the logical storage area by the I / O in the disk array control device is as follows.
There is a problem that it is not possible to determine how long O has accessed the physical storage area in the physical storage device or whether it has hit the cache of the physical storage device.

An object of the present invention is to solve the above-mentioned problems of the prior art and obtain the occupation time of a logical storage area in a physical storage device, thereby achieving a system configuration that cannot be obtained by a disk array controller alone. An object of the present invention is to provide a storage subsystem capable of acquiring the occupation time (actual operation time) of a logical storage area, and to provide a storage device used for the storage subsystem.

It is another object of the present invention to analyze the utilization rate of the logical storage area of the disk array system and reduce the error in the utilization rate prediction by considering the influence on the physical storage device for each I / O. To provide a storage subsystem capable of reducing the size and obtaining more accurate access occupation time information for each I / O to a physical storage device in order to perform more optimal performance tuning, and
An object of the present invention is to provide a storage device used for this.

[0014]

According to the present invention, an object of the present invention is to connect a plurality of computers and a plurality of physical storage devices, and a means for acquiring usage status information of the plurality of physical storage devices. A storage subsystem having means for associating a logical storage area to be read / written by the computer with a physical storage area of the physical storage device, and acquires usage status information of the plurality of physical storage devices. Means, and means for associating a logical storage area to be read / written by the computer with a physical storage area of the physical storage device are provided in a control device that controls the plurality of physical storage devices, The control device further includes:
Means for transmitting, to each of the plurality of physical storage devices, information in which a logical storage area of a physical storage device is associated with a physical storage area of a physical storage device, wherein each of the plurality of physical storage devices is This is achieved by providing a storage area control device, wherein the physical storage area control device has a unit for acquiring the use status of the physical storage area.

[0015] Further, the object is to provide a physical storage device constituting a storage subsystem, comprising a physical storage area control device, wherein the physical storage area control device obtains the use status of the physical storage area, Means for storing physical storage area usage status information, transmitting the physical storage area usage status information of its own physical storage device to the control device in response to a request for acquiring the physical storage region usage status information received from the control device This is achieved by providing means for storing information that associates the logical storage area of the physical storage device with the physical storage area received from the control device.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of a storage subsystem according to the present invention and a storage device used in the system will be described below in detail with reference to the drawings.

FIG. 1 is a block diagram showing a configuration of a computer system having a storage subsystem according to the present invention, and FIG. 2 is a block diagram showing a configuration of a physical storage device. 1 and 2, 10 is a host, 12 is a storage subsystem, 13 is a disk array controller, 14 is disk array control information, 15 is a physical storage device, 16 is a disk array, 17 is a control terminal, and 18 is an I / O bus, 1
9 is a network, 22 is a physical storage area controller, 23
Is a physical storage area, 130 is a read / write processing unit, 13
1 is a use status information acquisition processing unit, 132 is a relocation determination processing unit, 133 is a relocation execution processing unit, 141 is logical / physical correspondence information, 142 is class configuration information, 143 is class attribute information, and 144 is a logical area use Status information 145 is physical area use status information, 146 is relocation determination target period information, 1
47 is relocation execution time information, 148 is unused area information,
149 is relocation information, 14A is storage device occupation time information,
221, a physical storage area control unit; 222, a cache memory; 223, an operation information acquisition unit; 224, a data processing control unit; 225, an access request information storage unit;
The classification information management unit 227 is an occupation time totaling unit.

The computer system shown in FIG. 1 is composed of one or more hosts 10, storage subsystems 12, and control terminals 17, which are higher-level computers. Host 10
Is connected to the storage subsystem 12 via an I / O bus 18 and issues I / O to the storage subsystem 12 for data read and write processing. This I
When performing / O, the host 10 specifies a logical storage area of the storage subsystem 12. That is, the host 10 operates on the data in the storage subsystem.
Normally, access is performed using an address of a logical storage area. The I / O bus 18 is, for example, ESCON, S
It is composed of CSI, fiber channel, etc.

The storage subsystem 12 comprises a disk array controller 13 and a plurality of physical storage devices 15. The disk array controller 13 includes a read / write processing unit 130 and a use status information acquisition processing unit 131
, The relocation determination processing unit 132 and the relocation execution processing unit 13
And these processing units perform read / write processing,
Processing such as usage information acquisition processing, relocation determination processing, and relocation execution processing is performed. In addition, the storage subsystem 12
The disk array control information of the disk array configuration information 1400 includes disk array configuration information 1400 such as logical storage area / physical storage area correspondence information 141, class configuration information 142, class attribute information 143, etc., logical area usage status information 144, and physical area usage status information 14.
5, storage device occupation time information 14A, relocation determination period information 146, relocation execution time information 147, unused area information 148, relocation information 149, and the like. The above-described disk array configuration information 14 includes:
In addition to the information described above, parity group information, RAID level information, and the like may be included.

The host 10, the disk array controller 13 and the control terminal 17 are mutually connected by a network 19. The network 19 may be configured by, for example, Ethernet (registered trademark), FDDI, Fiber Channel, or the like. The control terminal 17 is usually used for performing maintenance / management of the storage subsystem 12 and the like.

The host 10, the disk array controller 13 and the control terminal 17 each have a component such as a memory and a CPU for performing the respective processes, which are always present in the computer. Since it is not important in the description of the mode, it is not specified here.

The plurality of physical storage devices 15 provided in the storage subsystem 12 are classified into classes according to the performance of the physical storage devices, and the disk array 1 is classified into classes.
6. Although not explicitly shown here, a parity group is configured using a plurality of physical storage devices. As shown in FIG. 2, each of the physical storage devices 15 includes a physical storage area 23 and a physical storage area control device 22 that controls the physical storage area 23.
The physical storage area 23 stores various data.

As described above, the address of the physical storage area 23 is not directly visible from the host 10, and the host 10 is on a plurality of logical storage areas on the plurality of physical storage areas 23. Access data. That is, the host 10 performs the following operations on the data in the storage area of each physical storage device 15 in the storage subsystem 12.
Access is performed by specifying a logical storage area.

The disk array controller 13 is connected to a plurality of physical storage devices 15, controls the plurality of physical storage devices 15, and receives read / write processing instructions I / O issued from the host 10. The data I / O is transmitted to the appropriate physical storage device 15 by associating the address of the logical storage region where the specified data exists with the address of the physical storage region where the address of the logical storage region is located, and the write process is performed. For example, the data transmitted from the host 10 is transmitted to the physical storage device 15. In the case of a read process, the data transmitted from the physical storage device 15 is received.
And the like.

The physical storage area control device 22 provided in the physical storage device 15 comprises a physical storage area control unit 221 and a cache memory 222. The cache memory 222 has a higher data read / write processing speed than the physical storage area 23. The cache memory 222 is used as follows with respect to data related to a read or write command transmitted from the disk array control device 13. That is, in the case of write processing, when write data transmitted from the disk array control device 13 is written to the physical storage area 23, the data is also written to the cache memory 222. In the case of read processing, when data is read from the physical storage area 23, the read data is written to the cache memory 222, or the same data exists in the cache memory by the previous read processing, and When the disk array controller 13 receives a read command from the physical storage area 23 as a read command, the data is not read from the physical storage area 23 and the cache memory 22
Read from 2. Thereby, the processing performance of the physical storage device 15 can be improved.

The physical storage area control section 221 mainly comprises an operation information acquisition section 223 and a data processing control section 224. The data processing control unit 224 receives a data read or write command transmitted from the disk array control device 13. If the received command is a read command, the data processing control unit 224 accesses the cache memory 222, and if the read data exists in the cache memory 222, reads the read data from the cache memory 222, and If the data does not exist in the memory 222, the physical storage area 23 is accessed to read the read data, and the data is transmitted to the disk array controller 13. Also,
If the received command is a write process command, the data processing control unit 224 writes the data transmitted from the disk array control device 13 into the cache memory 222, Write to. The write data may be written directly to the physical storage area 23 without writing to the cache memory 222.

The operation information acquisition unit 223 includes an access request information storage unit 225, a configuration / classification information management unit 226, an occupation time totaling unit 227, and the like. When the data processing control unit 224 accesses the logical storage area having the data specified by the I / O processing, the physical storage area 23 where the data exists, or the cache memory 222, the access time is determined. Information is classified into each processing type of I / O processing (random access, sequential access, etc.) and recorded in the occupation time totaling unit 227.
Further, the data processing control unit 224 receives, from the disk array control device 13, information on correspondence between the addresses of the logical storage areas in the disk array and the addresses of the physical storage areas 23, and information on the performance of the physical storage apparatus 15 and the like. Record in the classification information management unit 226. Further, the data processing control unit 22
4 receives data read or write command data or the like transmitted from the disk array controller 13 or the like so as to be able to receive a plurality of I / O processes, and stores the command in the access request information storage unit 225. Record the data.

Since the physical storage device 15 has the above-described configuration, the access when accessing the logical storage area, the physical storage area 23, or the cache memory 222 by the I / O processing in the physical storage device 15 is performed. It is possible to classify the time information of the time into each processing type of the I / O processing (random access or sequential access, etc.) and record the information in the occupation time totaling unit 227. It is possible to classify whether the time has been accessed or hit in the cache memory 22 of the physical storage device 15 and total the occupation time.

FIG. 3 is a flowchart for explaining the processing operation of the disk array control device when the storage subsystem is started, and this will be described below.

(1) When the storage subsystem 12 is started, the disk array controller 13 sends the physical storage device 1 to the physical storage device 15 connected to its own device 13.
5, logical / physical correspondence information 14 which is correspondence information between the address of the logical storage area in the physical storage area 23 and the address of the physical storage area in which the logical storage area actually exists.
1. The disk array configuration information 14 such as the class configuration information 142 and the class attribute information 143 is transmitted (step 30).
0, 310).

(2) Next, the disk array controller 13
When the physical storage device 15 becomes accessible by the above-described information transmission, the physical storage area control device 22
Is received from the physical storage device 15 that the ready state is accessible. In this case, the physical storage device 15 has been initialized by the disk array configuration information 14 (step 320).

(3) Subsequently, the disk array controller 1
Reference numeral 3 denotes a storage subsystem 12 from the host 10 via the I / O bus 18 to the storage subsystem 12.
Various data such as those that have transmitted host I / O for read and write processing to the logical storage areas within the disk array and those that transfer commands and data between disk array controllers are received (step 330).

(4) Host I / O as received data
Received, the disk array controller 13 receives a read or write request for the logical storage area designated by the host I / O, and changes the address (logical address) of the logical storage area to the address (physical address) of the physical storage area. Using the logical / physical correspondence information 141 to be converted to an address, an address of the physical storage area 23 corresponding to the logical storage area address is obtained (steps 340 and 350).

(5) The disk array control device 13 specifies the address of the physical storage area where the predetermined data exists, and in the case of the read processing, reads the read data from the physical storage device having the above-mentioned physical address. In the case of write processing, it receives the write data transferred from the host 10 and transfers the write data to the physical storage device having the physical address (36).
0).

FIG. 4 is a flowchart for explaining the processing operation of the disk array controller when the correspondence between the address of the logical storage area and the address of the physical storage area changes.
Hereinafter, this will be described.

(1) The disk array controller 13 can increase or decrease the physical storage device 15, change the RAID level, or move the logical storage area to a physical storage area address different from the current physical storage area address. It monitors that the correspondence between the address of the logical storage area and the address of the physical storage area has changed, and if there has been a change, the physical storage apparatus 15 is again notified of the physical storage area 23 in the physical storage apparatus 15.
, Logical / physical correspondence information 141 which is correspondence information between the address of the logical storage area in the logical storage area and the address of the physical storage area in which the logical storage area actually exists, and the class configuration information 14
2. The disk array configuration information 14 such as the class attribute information 143 is transmitted (step 3101).

(2) Next, the disk array controller 13
When the physical storage device 15 becomes accessible by the above-described information transmission, the physical storage area control device 22
Is received from the physical storage device 15 that the ready state is accessible. At this point, the physical storage device 15 has been updated with the disk array configuration information 14 (step 3201).

(3) Subsequent processing is executed in the same manner as in steps 3300, 3400, 3500 and 3600 described with reference to FIG. 3 (steps 3301 and 340).
1, 3501, 3601).

It should be noted that steps 320 and 3201 described above are performed.
In, the disk array control device 13 may not need to receive, from the physical storage area control device 22, information that the physical storage device 15 has transitioned to the accessible state. In this case, assuming that the physical storage device 15 can be accessed such as read or write after a certain fixed time, and when an instruction to access any storage area comes to the disk array control device 13, Physical storage device 15
An access process for performing a predetermined process may be performed.
If there is no response to the predetermined access process, the access process is performed again to perform the predetermined process, or the process waits until the response returns. A method of notifying the module that issued the access instruction may be used.

The logical / physical correspondence information 1 described above
41 is information for associating a logical storage area with a physical storage area. The logical address is an address indicating a logical storage area used by the host 10 in the read / write processing unit 130. The physical address is an address indicating an area on the physical storage device 15 where data is actually stored, and includes a physical storage device number and an address in the physical storage device. The storage device number corresponds to each physical storage device 15.
Is shown. The storage device address is an address indicating a storage area in the physical storage device 15.

FIG. 5 is a flowchart for explaining the processing operation of the disk array control device 13 when the disk array control device 13 reads out the information in the operation information acquisition section 223 of the physical storage device 15. This will be described below. .

(1) After the storage subsystem 12 is started, the disk array control device 13 initializes the storage device occupation time information 14A, and then stores the physical storage device in a plurality of connected physical storage devices 15. A request to acquire 15 access occupation time information is transmitted (step 37).
1, 372).

(2) Next, the disk array controller 13
Receives the access occupation time information from each physical storage device 15 and stores the access occupation time information of each physical storage device in the storage device occupation time information 14A (step 373,
374).

The above-described disk array control device 1
The acquisition timing of the access occupation information of the host I
A method of reading access occupation information by accessing the physical storage device 23 from another module such as / O or backup from the occupation time totaling unit 227 in each physical storage device 15 at a fixed time interval, or using another module (for example, the host 10 or There are various cases such as when an access occupation time information acquisition request is transmitted from the control terminal 17) to the disk array control device 13, and depends on the design.

The access occupation time information acquired as described above is recorded in the occupation time totaling table in the disk array controller 13.

FIG. 6 is a flowchart for explaining the processing operation of the physical storage area control device 22 in the physical storage device 15, which will be described next.

(1) The physical storage area control unit 22 transmits data transmitted from the disk array control unit 13 when the storage subsystem 12 is started, that is, the logical address and the physical address in the physical storage area 23 of the physical storage unit 15. The disk array configuration information 14, which is information on correspondence with the above, is received (steps 400 and 401).

(2) The physical storage area control device 22 that has received the disk array configuration information 14 uses the configuration / classification information management table of the configuration / classification information management unit 226 in the operation information acquisition unit 223 based on the information. The occupation time totaling unit 227 initializes the creation of the occupation time totaling table (step 4).
02).

(3) When the initialization of the table in step 402 is completed, the disk array controller 13 is notified of the completion of the initialization in order to recognize that the physical storage device 15 is accessible. . In addition,
It is not necessary to transmit to the disk array controller 13 the information that has changed to a state where the physical disk device can be accessed.
In this case, when a certain storage area access instruction is issued to the physical storage area control device 22 of the physical storage device 15 after a predetermined time, the physical storage area control device 22 executes the physical storage area control to perform a predetermined process. If the physical storage area 23 is accessible, the physical storage area 23 is accessed and predetermined processing is performed. If not, the access information is stored in the access request information storage unit 225 so that the physical storage area can be accessed. In this state, a predetermined process may be performed, or some access instruction to the storage area may not be accepted until the physical storage area 23 can be accessed to perform the predetermined process ( Step 4
03).

(4) Thereafter, the physical storage area controller 22
Are the host I / O from the disk array controller 13 and
It waits for a physical storage device operation information acquisition request command or new disk array configuration information to be transmitted and receives it (step 404).

(5) In step 404, when a host I / O is received from the disk array controller 13, the I / O
It is determined whether O is a read process or a write process. If the read process is a read process, the data processing control unit 224 checks whether data to be read exists in the cache memory 22 (steps 405 and 406).

(6) If the data is found in the cache memory 22 in the check in step 406, the data is read from the cache memory 22. If the data is not found in the cache memory 22, the physical The data is read from the storage area 23, and the data is transferred to the disk array controller 13 (steps 407, 709, 408).

(7) If it is determined in step 405 that the host I / O is a write process, the data processing control unit 224 receives the write data transferred from the host 10 and writes the write data in the cache memory 22. Data is written (steps 410 and 411).

(8) The data processing control unit 224
Notifies the disk array controller 13 of a data write end notification and stores the above-described write data in the physical storage area 23 (steps 412 and 413).

(9) After the processing of step 408, or
After the processing of step 413, the data processing control unit 224
Information on whether the cache memory 22 or the physical storage area 23 has been accessed, JOB type information such as random read or sequential read, and random read / write or sequential read when writing write data to the physical storage area 23 / JO such as light
The access type of the B type information is recognized, and the occupation time information accessing the cache memory 22 or the physical storage area 23 is stored in the occupation time totaling unit 227 in the operation information acquiring unit 223 for each access type (steps 414 and 4).
15).

(10) Upon receiving new disk array configuration information from the disk array controller 13 in step 404, the data processing control unit 224 causes the operation information acquisition unit 22
3 is rewritten according to the new disk array configuration information (step 4).
18, 419).

(11) When a physical storage device operation information acquisition request command is received from the disk array control device 13 in step 404, the data processing control unit 224 stores it in the occupation time totaling unit 227 in the operation information acquisition unit 223. It reads out the access occupation time information of the physical storage device 15 and sends it to the disk array controller 13 (steps 416 and 417).

The transmission of the occupation time information from the physical storage device 15 to the disk array control device 13 in the processing in step 417 described above is performed at regular time intervals.
5 to the disk array controller 13 automatically. In this case, the disk array controller 13
, The physical storage device operation information acquisition request command is not transmitted to the physical storage device 13.

FIG. 7 shows the logical / logical table in the table for managing the correspondence between the address of the logical storage area and the address of the physical storage area held in the disk array controller 13.
FIG. 3 is a diagram illustrating a configuration example of physical correspondence information 141.

The disk array controller 13 manages the correspondence between the address of the logical storage area in the physical storage area 23 in the plurality of connected physical storage apparatuses 15 and the address of the physical storage area in the logical storage area. are doing. The logical / physical correspondence information 141 used for this is, as shown in FIG. 7, a logical storage area number 500 assigned to a specific logical storage area, a logical address 510, and a physical storage where the logical storage area is located. A physical address 520 based on a storage device number 521 having an area and a physical storage region address 522, a raid level 530 indicating the performance of the physical storage device 15, and a parity group number 540 to which the physical storage device 15 belongs Are associated with each other. By having such logical / physical correspondence information 141, the disk array controller 13
When a process such as read / write is accessed from the local disk array controller 13 by specifying the address of the logical storage area from the control terminal 17, the control terminal 17, or another module (for example, another disk array controller), By converting the address of the logical area to the address of the physical storage area, data read / write processing can be performed accurately on the physical storage device 15.

FIG. 8 is a diagram showing an example of the storage device occupation time information 141 such as the logical area usage information 144 and the physical area usage information 145 stored in the disk array controller 13. These pieces of information are configured as an occupation time totaling table.

The disk array controller 13 has a host I
The access occupation information to the physical storage area 23 of the physical storage device 15 due to access from other modules such as / O and backup is periodically read from the occupation time totaling unit 227 in each physical storage device 15 and the access occupation information is read. The time information is recorded in the occupation time totaling table in the receiving disk array control device 13. In the example shown in FIG. 8, the occupation times are totaled for each logical storage area number 601 and each I / O job type 602. As the I / O JOB type, in the illustrated example, sequential read 610, sequential write data 620, sequential write parity 630, random read 640, random write parity 660, cache hit 670, total 68
Although 0 is shown, there may be other I / O JOB types.

The occupation time read from the physical storage device 15 is not limited to the above, but may be a record based on the accumulated value of the access occupation time for each I / O, a universal time value, or a machine-specific time value. Further, the disk array control device 13 edits the access occupation time of each logical storage area and physical storage area, and newly obtains the occupation time information based on the value obtained for the access occupation time for each physical storage apparatus and each parity group. You may create a table.

As described above, when the host 10 or the control terminal 17 or the like issues a request for acquiring operation information of a physical storage device to the disk array subsystem 12, the host 10 or the control terminal 1
7 and the like, the access occupation time information of the logical storage area and the physical storage area is obtained from the disk array control device 13 without directly accessing the physical storage apparatus 15 and acquiring the access occupation time information of the logical storage area and the physical storage area. Can be obtained.

FIG. 9 shows a table for managing the correspondence between the address of the logical storage area and the address of the physical storage area stored in the configuration / classification information management section 226 in the operation information acquisition section 223 in the physical storage device 15. It is a figure showing the example of composition.

Data processing control unit 2 in physical storage device 15
Reference numeral 24 denotes an address of a logical storage area and an address of a physical storage area which are generated by the disk array controller 13 when the storage subsystem 12 is started, when the number of physical storage devices increases or decreases, when a RAID level changes, or when a logical storage area is moved. Is changed, the association information between the logical storage area and the physical storage area is received and stored in the configuration / classification information management unit 226 in an association table as shown in FIG. This correspondence table includes a logical storage area number 700 and a logical address 71 assigned to a specific logical storage area.
0, a storage device number 721 having a physical storage area where the logical storage area is located, and an address 722 of the physical storage area
And a physical address 7520. Thereby, the physical storage device 15 can recognize which address logical storage area is located in the physical storage area address in the own physical storage device 15.

FIG. 10 is a diagram showing an example of the configuration of a table of occupation time information by accessing the storage area by I / O accumulated and stored in the occupation time totaling section 227 of the operation information acquisition section 223 in the physical storage device 15. It is.

This table stores the logical storage area number 801
For each I / O job type 802, the occupation time is totaled. In the illustrated example, as the I / O JOB type,
Sequential read 810, sequential write data 820, sequential write parity 830, random read 840, random write parity 860,
Although a total of 880 is shown at the time of a cache hit 870, there may be other I / OJOB types.

Data processing control unit 2 in physical storage device 15
24, when the storage device is accessed by I / O from the host or the like, the occupation time 8 for each accessed JOB type 802 for each accessed logical storage area 801.
90 is accumulated in the occupation time totaling unit 227. This allows
The relationship between the number of the logical storage area in the physical storage device 15, the occupation time according to the type of access to the logical storage area, and the total occupation time within a certain time can be obtained in the physical storage device 15.

According to the above-described embodiment of the present invention, I / O
O occupancy time information of the storage device for each O can be obtained,
Further, acquisition of the occupation time information of the storage device by accessing the storage area can be realized in the physical storage device.

According to an embodiment of the present invention,
Each of the plurality of physical storage devices constituting the storage subsystem can acquire the occupation time of the logical storage region of the physical storage device, and each logical storage region can be acquired in a system configuration that cannot be acquired only by the disk array control device. Occupancy time (actual operation time) can be obtained. According to the above-described embodiment of the present invention, one I / O
By considering the effect on each physical storage device, it is possible to reduce the error of the analysis and utilization prediction of the utilization ratio of the logical storage area of the storage subsystem, and to perform more optimal performance tuning, It is possible to obtain access occupation time information for each I / O to a physical storage device with higher accuracy.

[0072]

As described above, according to the present invention, a physical storage device can acquire the occupation time of a logical storage region, and each logical storage region can be acquired by a system configuration that cannot be acquired by a disk array controller alone. Occupation time (actual operation time)
Can be obtained.

Further, according to the present invention, the access occupation time information for each I / O to the physical storage device can be obtained, so that the storage considering the influence on the physical storage device for each I / O is considered. The analysis of the utilization ratio of the logical storage area of the subsystem and the prediction of the utilization ratio can be performed with a small error, and the performance of the storage subsystem can be more optimally tuned.

[Brief description of the drawings]

FIG. 1 is a block diagram showing a configuration of a computer system including a storage subsystem according to the present invention.

FIG. 2 is a block diagram illustrating a configuration of a physical storage device.

FIG. 3 is a flowchart illustrating a processing operation of the disk array control device when the storage subsystem is activated.

FIG. 4 is a flowchart illustrating a processing operation of the disk array control device when the correspondence between the address of the logical storage area and the address of the physical storage area changes.

FIG. 5 is a flowchart illustrating a processing operation of the disk array control device when the disk array control device reads information in an operation information acquisition unit of a physical storage device.

FIG. 6 is a flowchart illustrating a processing operation of a physical storage area control device in a physical storage device.

FIG. 7 is a diagram illustrating a configuration example of logical / physical correspondence information for managing correspondence between addresses of a logical storage area and a physical storage area held in a disk array control device.

FIG. 8 is a diagram showing an example of storage device occupation time information such as logical area usage information and physical area usage information stored in the disk array control device.

FIG. 9 is a diagram illustrating a configuration example of a table for managing correspondence between addresses of logical storage areas and physical storage areas stored in a configuration / classification information management unit in a physical storage device;

FIG. 10 is a diagram illustrating a configuration example of a table of occupation time information by accessing a storage area accumulated and stored in an occupation time totaling unit of an operation information acquisition unit in a physical storage device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Host 12 Storage subsystem 13 Disk array control device 14 Disk array control information 15 Physical storage device 16 Disk array 17 Control terminal 18 I / O bus 19 Network 22 Physical storage area control device 23 Physical storage area 130 Read / write processing unit 131 Usage status information acquisition processing unit 132 Relocation determination processing unit 133 Relocation execution processing unit 141 Logical / physical correspondence information 142 Class configuration information 143 Class attribute information 144 Logical area usage status information 145 Physical area usage status information 146 Relocation determination target period Information 147 Relocation execution time information 148 Unused area information 149 Relocation information 14A Storage device occupation time information 221 Physical storage area control unit 222 Cache memory 223 Operation information acquisition unit 224 Data processing control unit 225 Access request information storage unit 226 configuration and classification information managing unit 227 occupancy time counting unit

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Takashi Arakawa 1099 Ozenji Temple, Aso-ku, Kawasaki City, Kanagawa Prefecture Inside Hitachi, Ltd.System Development Laboratory (72) Inventor Takashi Oeda 1099 Ozenji Temple, Aso-ku, Kawasaki City, Kanagawa Prefecture Stock Company (72) Inventor Koji Arai 2880 Kofu, Odawara-shi, Kanagawa Prefecture F-term (Reference) 5 Hitachi Storage Systems Division, Hitachi, Ltd.

Claims (5)

[Claims] 1. A computer connected to one or a plurality of computers, a plurality of physical storage devices, means for acquiring usage status information of the plurality of physical storage devices, and a logical storage area to be read / written by the computer And a means for associating the physical storage device with the physical storage device, wherein each of the plurality of physical storage devices comprises a physical storage device control device, and the physical storage device control device comprises: A storage subsystem having means for acquiring a use status of a physical storage area. 2. A plurality of physical storage devices connected to one or a plurality of computers, means for acquiring usage status information of the plurality of physical storage devices, and a logical storage area to be read / written by the computer A storage subsystem having means for associating the plurality of physical storage devices with a physical storage area of the physical storage device, and a logical unit to be used as a read / write target by the computer. Means for associating a storage area with a physical storage area of the physical storage device is provided in a control device that controls the plurality of physical storage devices, and the control device further includes a logical storage device of the physical storage device. Means for transmitting information in which an area is associated with a physical storage area of a physical storage device to each of the plurality of physical storage devices; Each of the storage subsystems includes a physical storage area control device, and the physical storage area control device includes a unit for acquiring a use status of the physical storage area. 3. A physical storage device constituting a storage subsystem, comprising a physical storage region control device, wherein the physical storage region control device has means for acquiring a use status of a physical storage region. Claim 1 or 2
Physical storage device used for the storage subsystem described. 4. The physical storage apparatus according to claim 3, wherein said physical storage area control device further comprises means for storing the obtained usage status information of the physical storage area. 5. The physical storage area control device sends the physical storage area usage status information of its own physical storage device to the control device in response to a physical storage area usage status information acquisition request received from the control device. 5. The physical storage device according to claim 3, further comprising: a transmitting unit; and a unit configured to store information associated with a logical storage region and a physical storage region of the physical storage device received from the control device. .