CN102917055A - Method and device of online migration of virtual machine, and terminal device - Google Patents

Abstract

The invention discloses a method, device and terminal equipment for online migration of a virtual machine, belonging to the technical field of communication. The method includes: starting online migration; copying the memory pages of the virtual machine, and sending the copied memory pages to the destination host; Modifying the window threshold of the sent message to a second preset threshold, and sending the modified message to the destination client device, so that the message transmission does not continue between the destination client device and the virtual machine; suspend The running of the virtual machine copies the memory page in the updated state, and sends the copied memory page in the updated state to the destination host, so that the online migration of the virtual machine succeeds. The invention avoids the abnormal closing of the TCP connection caused by the unilateral shutdown and replication of the source host, and avoids the loss and incompleteness of data caused by the abnormal closing.

Description

Method, device and terminal equipment for online migration of virtual machine

technical field

The invention relates to the field of communication technology, in particular to a method, device and terminal equipment for online migration of a virtual machine.

Background technique

VM (Virtual Machine, virtual machine) technology is often used in data centers and cluster computing occasions. This technology allows multiple operating systems to run on the same physical machine, provides reliable isolation, and greatly improves the reusability of physical resources. In order to achieve online maintenance, online upgrade and dynamic load balancing of servers, online migration can be performed, also known as live migration, that is, to migrate a virtual machine from one computer to another while keeping the virtual machine running, and transfer it to the destination computer. resume operation.

So far, for VM migration, the mainstream pre-copy (pre-copy) strategy is generally adopted. The migration of the virtual machine is completed through the interaction between the source host and the destination host, and is carried out in a pre-copy manner. Specifically, online migration in the pre-copy mode may include: keeping the VM running, and the source host recycles the memory of the VM Pages are copied to the destination host. In the first cycle, all memory pages are transferred from the source host to the destination host, and only the modified pages (dirty pages) in the previous round of transfer are copied in subsequent cycles. Stop the VM on the source host and redirect its network connection to the destination host. The CPU status and pages modified during the previous round of transfer are transferred at this step. Finally, there are consistent VMs on the source and destination hosts. image. After the source host confirms that the migration is successful, the VM on it is discarded or destroyed. Start the VM migrated to the destination host, use the device driver of the destination computer after migration, and broadcast the new IP address.

In the process of implementing the present invention, the inventor finds that there are at least the following shortcomings in the prior art:

During the migration, for the memory part with a very fast update speed, because it will get dirty every cycle, it needs to repeat the pre-copy, which also leads to a very large number of cycles and a longer migration time. In response to this situation, the KVM virtual machine has adopted limited loop measures to control the number of loops, that is, to calculate the effect of each round of pre-copying. If the effect of pre-copying on reducing the amount of inconsistent memory is not significant, or the number of loops exceeds the upper limit , the loop will abort and enter the shutdown replication phase. However, in a scenario that requires high service availability, server downtime is unacceptable. Once an established session is forcibly interrupted, messages in transit will inevitably be lost, which may affect data consistency. and integrity.

Contents of the invention

In order to solve the problems in the prior art, the embodiments of the present invention provide a method, an apparatus and a terminal device for online migration of a virtual machine. Described technical scheme is as follows:

In one aspect, a method for online migration of a virtual machine, the method comprising:

Start online migration;

Copy the memory page of the virtual machine and send the copied memory page to the destination host;

When the number of memory pages in the update state in the virtual machine is less than the first preset threshold, modify the window threshold of the message sent by the virtual machine to the second preset threshold, and send the modified message to the destination The client device, so that the packet transmission between the destination client device and the virtual machine is not continued;

Suspending the operation of the virtual machine, copying the memory page in the update state, and sending the copied memory page in the update state to the destination host, so that the online migration of the virtual machine succeeds.

When the number of memory pages in the update state in the virtual machine is less than the first preset threshold, modify the window threshold of the message sent by the virtual machine to the second preset threshold, and send the modified message to the destination The client device, so that the message transmission is not continued between the destination client device and the virtual machine, and then further includes:

Buffering the messages sent by each client device to the virtual machine, and sending the cached messages to the destination host after sending the copied memory page in the update state to the destination host.

The method also includes:

When the number of memory pages in the update state in the virtual machine is less than the first preset threshold, modify the window threshold of the message sent by the client device to the virtual machine to a second preset threshold, and send the modified message The message is sent to the virtual machine, so that the message transmission between the client device and the virtual machine does not continue.

The second preset threshold is zero.

In another aspect, an apparatus for online migration of a virtual machine, the apparatus includes:

Startup module, used to start online migration;

The sending module is used to copy the memory page of the virtual machine, and send the copied memory page to the destination host;

A threshold modifying module, configured to modify the window threshold of the message sent by the virtual machine to a second preset threshold when the number of memory pages in the update state in the virtual machine is less than a first preset threshold, and change the modified The message is sent to the destination client device, so that the message transmission does not continue between the destination client device and the virtual machine;

The sending module is further configured to suspend the operation of the virtual machine, copy the memory page in the update state, and send the copied memory page in the update state to the destination host, so that the virtual machine is online The migration was successful.

The device also includes:

A caching module, configured to cache messages sent by each client device to the virtual machine; correspondingly, the sending module is also configured to send the copied memory page in an updated state to the destination host, The destination host sends the cached message.

The threshold modifying module modifies the window threshold of the message sent by the client device to the virtual machine to a second preset threshold when the number of memory pages in the update state in the virtual machine is less than a first preset threshold, and sending the modified message to the virtual machine, so that message transmission does not continue between the client device and the virtual machine.

The second preset threshold is zero.

In another aspect, a terminal device includes: a transceiver and a processor, the transceiver is coupled to the processor,

The transceiver is used to receive and send messages;

The processor is configured to start online migration;

The processor is further configured to copy the memory page of the virtual machine, and trigger the transceiver to send the copied memory page to the destination host;

The processor is further configured to modify the window threshold of the message sent by the virtual machine to a second preset threshold when the number of memory pages in the update state in the virtual machine is less than a first preset threshold, and trigger The transceiver sends the modified message to the destination client device, so that message transmission does not continue between the destination client device and the virtual machine;

The processor is further configured to suspend the operation of the virtual machine, copy the memory page in the update state, and trigger the transceiver to send the copied memory page in the update state to the destination host, so that The online migration of the virtual machine is successful.

The terminal device further includes: a memory, configured to cache messages sent by each client device to the virtual machine, and after sending the copied memory page in an updated state to the destination host, trigger the sending and receiving The router sends the buffered message to the destination host.

The processor is further configured to modify the window threshold of the message sent by the client device to the virtual machine to a second preset threshold when the number of memory pages in the update state in the virtual machine is less than a first preset threshold , and trigger the transceiver to send the modified message to the virtual machine, so that the message transmission between the client device and the virtual machine does not continue.

The second preset threshold is zero.

A method, device, and terminal device for online migration of a virtual machine provided by an embodiment of the present invention start the online migration through the source host; the source host copies a memory page of the virtual machine, and sends the copied memory page to the destination host; When the number of memory pages in the update state in the virtual machine is less than the first preset threshold, the source host modifies the window threshold of the message sent by the virtual machine to the second preset threshold, and sends the modified message send the message to the destination client device, so that the message transmission does not continue between the destination client device and the virtual machine; the source host suspends the operation of the virtual machine, copies the memory page in the updated state, And send the copied memory page in the updated state to the destination host, so that the online migration of the virtual machine succeeds. By adopting the technical solution provided by the present invention, during the online migration process of the virtual machine, when the number of memory pages in the update state is less than the first preset threshold, the window threshold of the message sent by the virtual machine is modified, so that the virtual machine The packet transmission volume between the target client device and the destination client device gradually decreases, and finally reaches the goal of zero traffic, and at this time, the memory page in the updated state is copied, which is equivalent to the virtual machine without packet transmission. Under the circumstances, the downtime copying is carried out, which avoids the abnormal closing of the TCP connection caused by the unilateral downtime copying of the source host, and further avoids the data loss and data incompleteness caused by the abnormal closing.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings that need to be used in the description of the embodiments will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the present invention. For those skilled in the art, other drawings can also be obtained based on these drawings without creative effort.

Fig. 1 embodiment of the present invention provides a flow chart of a virtual machine online migration method;

FIG. 2 is a flowchart of a method for online migration of a virtual machine provided by an embodiment of the present invention;

FIG. 3 is a schematic structural diagram of a virtual machine online migration device provided by an embodiment of the present invention;

Fig. 4 is a schematic structural diagram of a terminal device provided by an embodiment of the present invention.

Detailed ways

In order to make the object, technical solution and advantages of the present invention clearer, the implementation manner of the present invention will be further described in detail below in conjunction with the accompanying drawings.

FIG. 1 provides a flowchart of a method for online migration of a virtual machine according to an embodiment of the present invention. The execution subject of this embodiment is a source host, and the source host is a server or a terminal device running a virtual machine. Referring to Figure 1, the method includes:

101: start online migration;

102: Copy the memory page of the virtual machine, and send the copied memory page to the destination host;

103: When the number of memory pages in the update state in the virtual machine is less than a first preset threshold, modify the window threshold of the message sent by the virtual machine to a second preset threshold, and send the modified message Send the message to the destination client device, so that the message transmission does not continue between the destination client device and the virtual machine;

104: The source host suspends the operation of the virtual machine, copies the memory page in the updated state, and sends the copied memory page in the updated state to the destination host, so that the online migration of the virtual machine succeeds .

Adopting the technical solution provided by the present invention, during the online migration process of the virtual machine, when the number of memory pages in the update state is less than the first preset threshold, modify the window threshold of the messages sent and received on the source host, so that the sending The amount of message transmission between the end and the receiving end gradually decreases, and finally reaches the goal of zero traffic, and at this time, the memory page in the update state is copied, which is equivalent to the situation where there is no message transmission in the virtual machine Downtime replication is carried out under the following conditions, which avoids the abnormal shutdown of the TCP connection caused by the unilateral shutdown of the source host, and further avoids data loss and data incompleteness caused by abnormal shutdown.

Fig. 2 The embodiment of the present invention provides a flow chart of a virtual machine online migration method, referring to Fig. 2, the method flow includes:

201: The source host starts online migration;

For the source host, multiple virtual machines can run on the source host at the same time, and this embodiment of the present invention only uses online migration of one of the virtual machines as an example for illustration. Specifically, when the source host starts online migration, During the process, the destination host is selected. The destination host refers to the destination terminal for online migration of the virtual machine. The source host initiates a migration request to the destination host. The destination host confirms whether the destination host currently has the necessary resources. Reserve these resources and respond to the request of the source host at the same time; if not, the destination host rejects the request of the source host, so that the virtual machine is still running on the source host, and the source host can continue to select other destination terminals as the destination host.

202: The source host copies the memory page of the virtual machine, and sends the copied memory page to the destination host;

After the destination host is selected, the source host copies the memory pages of the virtual machine to the destination host in an iterative manner, and the virtual machine is still running at this stage, and this step 202 refers to the first round of iteration in the iteration process. In this first iteration, the source host copies all memory pages and sends all the copied memory to the destination host, and during this first iteration, the virtual machine also includes memory pages in an updated state , that is, pages that have been modified during the previous round of copying and sending, we call them dirty pages.

Among them, dirty page is a concept in the Linux kernel. Because the read and write speed of the hard disk is far behind the speed of the memory, the system puts the data that is read and written more frequently into the memory in advance to improve the read and write speed. This is called cache. Linux uses pages as the unit of cache. When a process modifies the data in the cache, the page is marked as a dirty page by the kernel, and the kernel will write the data of the dirty page to the disk at an appropriate time, so as to Keep the data in the cache consistent with the data on disk.

203: The source host modifies the window threshold of the packet sent by the virtual machine to zero, and sends the modified packet to the destination client device, so that the communication between the destination client device and the virtual machine Do not continue message transmission;

For a virtual machine, it may serve multiple client devices. Therefore, when the virtual machine sends a message, it is sent to the destination client device. The destination client device can be multiple clients served by the virtual machine. One or more of the end devices are not specifically limited in this embodiment of the present invention.

204. The source host modifies the window threshold of the packet sent by the client device to the virtual machine to a second preset threshold, and sends the modified packet to the virtual machine, so that the client device Do not continue message transmission with the virtual machine;

For a virtual machine, since it may serve multiple client devices, the source host may receive packets from multiple client devices, not necessarily only the packets of the destination client device in step 203, Therefore, it is necessary to modify the window threshold of the message whose receiving end is a virtual machine, so that message transmission does not continue between the virtual machine and the client device sending the message.

Furthermore, for steps 203 and 204, there is also the following implementation: according to the specific update situation of the memory page in the update state on the virtual machine, it is judged whether the update is caused by the message sending of the virtual machine, if not, Then execute step 203, and if yes, execute step 204. Preferably, in order to avoid complicated procedures, in this embodiment of the invention, only the execution of step 203 and step 204 is taken as an example for illustration.

Since the virtual machine also includes dirty pages during the copying and sending process in step 202, in order to ensure that the virtual machine in the update state can be updated without being perceived by the user in a short period of time without forced downtime copying The memory page is copied and sent. The embodiment of the present invention limits the remaining number of memory pages in the update state, and the remaining number needs to be less than the first preset threshold. Therefore, before performing steps 203 and 204, the method can also Including multiple iterations, in the process of each iteration, copy and send the memory page that was in the update state in the previous iteration process, that is, the modified memory page. It should be noted that the first preset threshold can be determined by Technicians make settings according to the performance of the source host and/or destination host, data replication speed, etc.

In this embodiment, a TCP connection between the client device and the virtual machine is used as an example for illustration, and the packets in this embodiment are all TCP packets. For TCP packets, the window (Window) threshold It is used to indicate the receiving window that allows the receiving end to send messages, and its number of bytes is used to notify the receiving end that it can only send data of the size of the receiving window. Therefore, by modifying the message window threshold in steps 203 and 204, Flow control can be performed on packet transmission between the virtual machine and the client device, and the second preset threshold can take values of 0, 1, 2, 3, . . . and so on. Preferably, the second preset threshold is 0.

It should be noted that the sending, receiving, and modifying described in this embodiment can all be implemented by the network card of the source host server, and of course, can also be implemented by corresponding functional modules in the source host.

Specifically, the specific implementation of step 203 may be: the server network card of the source host receives the first packet from the virtual machine, then modifies the window threshold of the first packet to the second preset threshold, and converts the modified sending the first message to the destination client device, so that message transmission does not continue between the destination client device and the virtual machine;

Specifically, the specific implementation of step 204 may be: if the network card of the source host server receives the second message from the virtual machine sent by the client device, the network card of the source host server sets the window threshold of the second message to modifying to the second preset threshold, and sending the modified second message to the virtual machine, so that the message transmission between the client device and the virtual machine does not continue.

205: Close the TCP connection between the destination client device and the virtual machine;

When the destination client device receives a TCP message with a window threshold of 0, it will wait for 1-2 seconds, and then send a detection message with a window threshold of 0 to see if the source host virtual machine server is allowed to send data. If the window threshold value in the TCP message sent by the source host server is still 0, then continue to wait, otherwise, the destination client device will transmit data, if the window threshold value in the TCP message obtained by the destination client device multiple times is 0, A TCP close handshake message will be sent, and after receiving the message, the virtual machine will send a close handshake response to close the TCP connection between the destination client device and the virtual machine.

Similarly, when the virtual machine receives multiple TCP packets with a window threshold of 0, it will also send a TCP close handshake message, and the client device will send a close handshake response after receiving it. The TCP connection is closed.

206: The source host suspends the operation of the virtual machine, copies the memory page in the updated state, and sends the copied memory page in the updated state to the destination host, so that the online migration of the virtual machine succeeds ;

Since the TCP connection has been closed in step 205, the data flow of the TCP connection is greatly reduced, so that the source host where the virtual machine is located can copy and send the memory page in the updated state in a very short time, therefore, the source host pauses The operation of the virtual machine redirects its network connection to the destination host, and the memory pages in the updated state in the source host are transferred in this step until there are consistent virtual machine images on the source host and the destination host.

207: When the source host receives a packet sent by the client device to the virtual machine, the source host caches the received packet;

During downtime replication, both the source and destination hosts are unavailable. At this time, for the client device (which may also include the destination client device in this embodiment) and the virtual machine that has not closed the TCP connection, the connection between them still exists, and at the same time, there may be a new client device sending a connection Request, the message sent by the client device is stored in the server network card cache of the source host, so that the destination host can continue to communicate with the client device after enabling the virtual machine. While ensuring data loss and data integrity, it also further ensures The virtual machine service will not be interrupted due to downtime replication.

208: The destination host activates the virtual machine, and the source host sends the cached packet to the destination host.

After the shutdown replication is completed, the destination host notifies the source host that it has successfully received the image of the virtual machine. The source host confirms the message. Then, the source host can discard or destroy the virtual machine on it. Broadcast the new IP address and establish a session connection with the client device.

According to a method for online migration of a virtual machine provided by an embodiment of the present invention, the online migration is started by the source host; the source host copies the memory page of the virtual machine, and sends the copied memory page to the destination host; when the virtual machine If the number of memory pages in the updated state is less than the first preset threshold, the source host modifies the window threshold of the message sent by the virtual machine to the second preset threshold, and sends the modified message to the destination client end device, so that the message transmission between the destination client device and the virtual machine does not continue; the source host suspends the operation of the virtual machine, copies the memory page in the updated state, and sends the message to the destination The host sends the copied memory page in the updated state, so that the online migration of the virtual machine succeeds. Adopting the technical solution provided by the present invention, during the online migration process of the virtual machine, when the number of memory pages in the update state is less than the first preset threshold, modify the window threshold of the messages sent and received on the source host, so that the sending The amount of message transmission between the end and the receiving end gradually decreases, and finally reaches the goal of zero traffic, and at this time, the memory page in the update state is copied, which is equivalent to the situation where there is no message transmission in the virtual machine Downtime replication is carried out under the following conditions, which avoids the abnormal shutdown of the TCP connection caused by the unilateral shutdown of the source host, and further avoids data loss and data incompleteness caused by abnormal shutdown. Further, by caching the packets received during the downtime replication on the source host, it can be further ensured that the virtual machine service will not be interrupted due to downtime replication.

Fig. 3 The embodiment of the present invention provides a structural diagram of a virtual machine online migration device, referring to Fig. 3, the device includes:

Start module 301, for starting online migration;

A sending module 302, configured to copy the memory page of the virtual machine, and send the copied memory page to the destination host;

A threshold modifying module 303, configured to modify the window threshold of the message sent by the virtual machine to a second preset threshold when the number of memory pages in the update state in the virtual machine is less than a first preset threshold, and modify the The subsequent message is sent to the destination client device, so that the message transmission does not continue between the destination client device and the virtual machine;

The caching module 304 is configured to cache the packets sent by each client device to the virtual machine; correspondingly, the sending module is also configured to send the copied memory page in the updated state to the destination host, Send the cached message to the destination host.

The sending module 302 is further configured to suspend the operation of the virtual machine, copy the memory page in the update state, and send the copied memory page in the update state to the destination host, so that the virtual machine Online migration was successful.

The threshold modifying module 303 is configured to modify the window threshold of the message sent by the client device to the virtual machine to the second threshold when the number of memory pages in the update state in the virtual machine is less than the first preset threshold. A threshold is preset, and the modified message is sent to the virtual machine, so that the message transmission between the client device and the virtual machine does not continue.

A device for online migration of a virtual machine provided by an embodiment of the present invention starts online migration; copies the memory pages of the virtual machine and sends the copied memory pages to the destination host; when the number of memory pages in the update state in the virtual machine is less than the first preset threshold, modifying the window threshold of the message sent by the virtual machine to a second preset threshold, and sending the modified message to the destination client device, so that the destination client device and the Do not continue message transmission between the virtual machines; suspend the operation of the virtual machine, copy the memory page in the update state, and send the copied memory page in the update state to the destination host, so that the The online migration of the virtual machine is successful. Adopting the technical solution provided by the present invention, during the online migration process of the virtual machine, when the number of memory pages in the update state is less than the first preset threshold, modify the window threshold of the messages sent and received on the source host, so that the sending The amount of message transmission between the end and the receiving end gradually decreases, and finally reaches the goal of zero traffic, and at this time, the memory page in the update state is copied, which is equivalent to the situation where there is no message transmission in the virtual machine Downtime replication is carried out under the following conditions, which avoids the abnormal shutdown of the TCP connection caused by the unilateral shutdown of the source host, and further avoids data loss and data incompleteness caused by abnormal shutdown.

It should be noted that: the virtual machine online migration device provided by the above embodiment only uses the division of the above-mentioned functional modules as an example when the virtual machine is migrated online. In practical applications, the above-mentioned functions can be assigned to different function Module completion means that the internal structure of the device is divided into different functional modules to complete all or part of the functions described above. In addition, the device for online virtual machine migration provided by the above-mentioned embodiments belongs to the same idea as the embodiment of the method for online migration of virtual machine, and its specific implementation process is detailed in the method embodiment, and will not be repeated here.

Those of ordinary skill in the art can understand that all or part of the steps for implementing the above embodiments can be completed by hardware, and can also be completed by instructing related hardware through a program. The program can be stored in a computer-readable storage medium. The above-mentioned The storage medium mentioned may be a read-only memory, a magnetic disk or an optical disk, and the like.

Fig. 4 is a schematic structural diagram of a terminal device provided by an embodiment of the present invention. Referring to FIG. 4, the terminal device includes: a transceiver 401 and a processor 402, the transceiver 401 and the processor 402 are coupled,

Transceiver 401, configured to receive and send messages;

The processor 402 is configured to start online migration;

The processor 402 is further configured to copy the memory page of the virtual machine, and trigger the transceiver 401 to send the copied memory page to the destination host;

The processor 402 is further configured to modify the window threshold of the message sent by the virtual machine to a second preset threshold when the number of memory pages in the update state in the virtual machine is less than a first preset threshold, and Triggering the transceiver 401 to send the modified message to the destination client device, so that the message transmission between the destination client device and the virtual machine does not continue;

The processor 402 is further configured to suspend the operation of the virtual machine, copy the memory page in the update state, and trigger the transceiver 401 to send the copied memory page in the update state to the destination host , making the online migration of the virtual machine successful.

The terminal device further includes: a memory 403, the memory 403 is coupled to the transceiver 401, the memory 403 is also coupled to the processor 402, and the memory 403 is used for buffering messages sent by each client device to the virtual machine, And after sending the copied memory page in the update state to the destination host, trigger the transceiver 401 to send the cached message to the destination host.

The processor 402 is further configured to modify the window threshold of the message sent by the client device to the virtual machine to a second preset when the number of memory pages in the update state in the virtual machine is less than a first preset threshold threshold, and trigger the transceiver 401 to send the modified message to the virtual machine, so that the message transmission between the client device and the virtual machine does not continue.

The second preset threshold is zero.

A terminal device provided by an embodiment of the present invention starts online migration; copies the memory pages of the virtual machine and sends the copied memory pages to the destination host; when the number of memory pages in the update state in the virtual machine is less than the first preset Setting a threshold, modifying the window threshold of the message sent by the virtual machine to a second preset threshold, and sending the modified message to the destination client device, so that the relationship between the destination client device and the virtual machine do not continue message transmission; suspend the operation of the virtual machine, copy the memory page in the update state, and send the copied memory page in the update state to the destination host, so that the virtual machine migrates online success. Adopting the technical solution provided by the present invention, during the online migration process of the virtual machine, when the number of memory pages in the update state is less than the first preset threshold, modify the window threshold of the messages sent and received on the source host, so that the sending The amount of message transmission between the end and the receiving end gradually decreases, and finally reaches the goal of zero traffic, and at this time, the memory page in the update state is copied, which is equivalent to the situation where there is no message transmission in the virtual machine Downtime replication is carried out under the following conditions, which avoids the abnormal shutdown of the TCP connection caused by the unilateral shutdown of the source host, and further avoids data loss and data incompleteness caused by abnormal shutdown.

The above descriptions are only preferred embodiments of the present invention, and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention shall be included in the protection of the present invention. within range.

Claims (12)

1. the method for the online migration of a virtual machine is characterized in that described method comprises:

Start online migration;

Copy the memory pages of virtual machine, and send the memory pages that copies to destination host;

In described virtual machine, be in the memory pages quantity of update mode less than the first predetermined threshold value, the window threshold modifying of the message that described virtual machine is sent is the second predetermined threshold value, and amended message sent to the purpose client device, so that do not continue message transmissions between described purpose client device and the described virtual machine;

Suspend the operation of described virtual machine, copy the described memory pages that is in update mode, and send the described memory pages that is in update mode that copies to described destination host, so that described virtual machine moves successfully online.

2. method according to claim 1, it is characterized in that, in described virtual machine, be in the memory pages quantity of update mode less than the first predetermined threshold value, the window threshold modifying of the message that described virtual machine is sent is the second predetermined threshold value, and amended message sent to the purpose client device, so that do not continue message transmissions between described purpose client device and the described virtual machine, also comprise afterwards:

The message that each client device of buffer memory sends to described virtual machine, and after sending copy described to described destination host and being in the memory pages of update mode, send the message of buffer memory to described destination host.

3. method according to claim 1 is characterized in that, described method also comprises:

In described virtual machine, be in the memory pages quantity of update mode less than the first predetermined threshold value, the window threshold modifying of the message that client device is sent to described virtual machine is the second predetermined threshold value, and amended message sent to described virtual machine, so that do not continue message transmissions between described client device and the described virtual machine.

4. each described method is characterized in that according to claim 1-3, and described the second predetermined threshold value is zero.

5. the device of the online migration of a virtual machine is characterized in that described device comprises:

Start module, be used for starting online migration;

Sending module is used for copying the memory pages of virtual machine, and sends the memory pages that copies to destination host;

The threshold modifying module, be used for being in the memory pages quantity of update mode less than the first predetermined threshold value when described virtual machine, the window threshold modifying of the message that described virtual machine is sent is the second predetermined threshold value, and amended message sent to the purpose client device, so that do not continue message transmissions between described purpose client device and the described virtual machine;

Described sending module also is used for suspending the operation of described virtual machine, copies the described memory pages that is in update mode, and sends the described memory pages that is in update mode that copies to described destination host, so that described virtual machine moves successfully online.

6. device according to claim 5 is characterized in that, described device also comprises:

Cache module is used for the message that each client device of buffer memory sends to described virtual machine; Correspondingly, described sending module also is used for sending the message of buffer memory to described destination host after sending copy described to described destination host and being in the memory pages of update mode.

7. device according to claim 5, it is characterized in that, described threshold modifying module is when the memory pages quantity that is in update mode in the described virtual machine during less than the first predetermined threshold value, the window threshold modifying of the message that client device is sent to described virtual machine is the second predetermined threshold value, and amended message sent to described virtual machine, so that do not continue message transmissions between described client device and the described virtual machine.

8. each described device is characterized in that according to claim 5-7, and described the second predetermined threshold value is zero.

9. a terminal equipment is characterized in that, described terminal equipment comprises: transceiver and processor, and described transceiver and the coupling of described processor,

Described transceiver is used for receiving and sending message;

Described processor is used for starting online migration;

Described processor also is used for copying the memory pages of virtual machine, and triggers the memory pages that described transceiver copies to the destination host transmission;

Described processor, also be used for being in the memory pages quantity of update mode less than the first predetermined threshold value when described virtual machine, the window threshold modifying of the message that described virtual machine is sent is the second predetermined threshold value, and trigger described transceiver amended message is sent to the purpose client device, so that do not continue message transmissions between described purpose client device and the described virtual machine;

Described processor, also be used for suspending the operation of described virtual machine, copy the described memory pages that is in update mode, and trigger the described memory pages that is in update mode that described transceiver copies to described destination host transmission, so that described virtual machine moves successfully online.

10. terminal equipment according to claim 9, it is characterized in that, described terminal equipment also comprises: memory, be used for the message that each client device of buffer memory sends to described virtual machine, and after sending copy described to described destination host and being in the memory pages of update mode, trigger described transceiver sends message from buffer memory to described destination host.

11. terminal equipment according to claim 9, it is characterized in that, described processor also is used for being in the memory pages quantity of update mode less than the first predetermined threshold value when described virtual machine, the window threshold modifying of the message that client device is sent to described virtual machine is the second predetermined threshold value, and trigger described transceiver amended message is sent to described virtual machine, so that do not continue message transmissions between described client device and the described virtual machine.

12. each described terminal equipment is characterized in that according to claim 9-11, described the second predetermined threshold value is zero.

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