WO2017067213A1

WO2017067213A1 - Device hot-replacement method and apparatus based on virtual machine

Info

Publication number: WO2017067213A1
Application number: PCT/CN2016/087920
Authority: WO
Inventors: 肖庆航
Original assignee: 华为技术有限公司
Priority date: 2015-10-20
Filing date: 2016-06-30
Publication date: 2017-04-27
Also published as: CN105279010B; CN105279010A

Abstract

A device hot-replacement method and apparatus based on a virtual machine. The method comprises: receiving a hot-replacement command (S310), the hot-replacement command carrying a virtual magnetic disk identifier, and the virtual magnetic disk identifier being corresponding to a logical device that needs to be replaced; generating a simulated logical device (S320), the simulated logical device having an identifier; sending control information of the logical device to the simulated logical device (S330), so that the simulated logical device can respond to a control instruction in a manner of acting as an agent of the logical device to be replaced; deleting a mapping relationship between the identifier of the virtual magnetic disk and the identifier of the logical device to be replaced according to the hot-replacement command (S340); and establishing a mapping relationship between the identifier of the virtual magnetic disk and the identifier of the simulated logical device (S350). Accordingly, when a fault occurs on a logical device, the logical device is replaced by a simulated logical device to respond to a corresponding control instruction, and further, a virtual machine can normally perform control operations on the device.

Description

Virtual machine-based device heat replacement method and device

Technical field

The present invention relates to the field of virtual machine technologies, and in particular, to a virtual machine-based device hot replacement method and device.

Background technique

Virtual Machine (VM) refers to a complete computer system that runs through a software and has a complete hardware system function and runs in a completely isolated environment. The virtual machine generates a completely new virtual image of the existing operating system. It has the same function as the real operating system. After entering the virtual system, all operations are performed in this new independent virtual system. The software can be installed and saved independently. Data and more.

Hot-plugging (hot-plugging or hot swap) is hot swapping and can also be called hot replacement. The hot-swap function allows the user to remove and replace damaged hard disks, power supplies or boards without shutting down the system, thus improving the system's ability to recover from disasters, scalability, and flexibility.

The virtual machine device is hot swapped. Since all the "hardware" seen by the VM from the perspective of the VM is simulated by the software provided by the VMM (virtual machine monitor), the "hardware" for the VM is used. Hot plugging is actually a software simulation of the VMM layer.

In the prior art, the VMM receives the hot plug operation request corresponding to the hot swappable virtual disk through the command line interface, triggers the hot plug operation, and the VMM sends the hot plug operation request to the corresponding virtual machine operating system; the virtual machine operates. The hot-plug event is driven to find the corresponding virtual device driver. The virtual device driver recovers the resources allocated to the hot-swappable virtual disk to implement hot-plugging of the hot-swappable virtual disk.

In this way, the hot plug operation can be performed effectively, but when the physical disk fails (for example, the head is damaged and the VMM cannot be accessed normally), the device drive is abnormally caused. The device driver that enables the hot swap operation of the logical device also has an abnormality, so that the hot pull operation of the device cannot be performed when the VM is running. Therefore, if the device fails and the device driver is abnormal, you can only shut down the VM; remove the failed device from the definition of the VM; and then repair the logical device or file corresponding to the VM at the VMM layer. However, in general, the VM is relatively large. It takes a long time to restart the VM and the loss is large. If the VM is on the server side, shutting down the VM may affect the client associated with the server, thus greatly affecting the user. Experience (for example, shutting down a VM for an online gaming service may affect the gaming experience of all users who log in to the server). Therefore, how to implement hot-plug operation of a faulty "device" in a virtual machine has become a technical problem that is urgently needed to be solved by those skilled in the art.

Summary of the invention

The embodiment of the invention provides a virtual machine-based device hot replacement method and device, which can implement a logic device to proxy a logical device when a logical device fails, and has responded to the corresponding control command, and then the virtual machine can be normal. Control the operation of the device.

In a first aspect, an embodiment of the present invention provides a virtual machine-based device hot replacement method, the method comprising: receiving a hot replacement command, where the hot replacement command carries a virtual disk identifier, wherein the virtual disk identifier corresponds to a need to be A replaced logical device (such as a logical device that has failed). An analog logic device is generated that has an identification (such as a descriptor, or a handle, etc.). The control information of the logical device to be replaced corresponding to the hot replacement command is sent to the analog logic device, so that the analog logic device can proxy the replacement logical device to respond to the control command. The mapping relationship between the identifier of the corresponding virtual disk and the identifier of the logical device to be replaced is deleted according to the hot replacement command, and the mapping relationship between the corresponding virtual disk and the analog logical device is established. At this time, the logical device is simulated. To respond to control instructions for the virtual disk (such as hot pull instructions, power off instructions).

Through the above method, even if the logical device fails to respond to the instruction due to the failure of the physical disk, after the logical device that cannot respond to the instruction is replaced with the analog logical device, at this time, at the virtual machine level, the logical device cannot be found. Fault, still able to correspond to the logical device The virtual disk is pulled out.

In a possible implementation manner of the first aspect, the method may further include: after establishing a mapping relationship between the identifier of the virtual disk and the identifier of the simulated logical device, according to the foregoing received hot replacement command, or newly receiving The extracted command (including the ID of the virtual disk that needs to be extracted) is recycled to the resources allocated to the virtual disk. Delete the mapping relationship between the ID of the virtual disk and the ID of the simulated logical device. This method can be used to delete the virtual disk corresponding to the failed logical device.

In some possible implementations of the first aspect, when a repaired logical device or another new logical device needs to be inserted, the mapping relationship between the identifier of the virtual logical disk and the identifier of the simulated logical device has not been deleted. The method may further include receiving a hot plug command, where the hot plug command includes an identifier of the virtual disk (the virtual disk corresponding to the replaced logical device) and an identifier of the logical device to be inserted. Delete the mapping between the ID of the virtual disk and the simulated logical disk, and establish the mapping relationship between the virtual disk and the identifier of the logical device to be inserted. After the logical device is proxyed by the analog logical device, the logical device can be directly repaired without deleting the device at the virtual machine level, and then the repaired logical device is reinserted or a new logical device is newly replaced. To replace the failed logical device, in other words, at the virtual machine level, it is not known that the failed logical device has been repaired or replaced with a logical device, thereby completing the device without affecting the normal operation of the virtual machine. Hot swap and repair.

In a second aspect, an embodiment of the present invention provides a virtual machine-based device hot-replacement device for implementing the method provided by the first aspect. The specific device includes: a receiving unit, configured to receive a hot-replace command. Generating unit for generating an analog logic device having an identifier. And a sending unit, configured to send control information of the logical device to be replaced to the analog logic device. The deletion unit is used to delete the mapping relationship between the identifier of the virtual disk and the identifier of the logical device. The establishing unit is configured to establish a mapping relationship between the identifier of the virtual disk and the identifier of the simulated logical device. The embodiment of the present invention can implement transparent replacement for the faulty device and the virtual machine, and further, does not affect the normal operation of the virtual machine.

In a possible implementation manner of the second aspect, the apparatus may further include a recycling unit, where the resources allocated to the virtual disk are recovered by the recycling unit when the virtual disk needs to be deleted.

In another possible implementation manner of the second aspect, when the logic device needs to be reinserted, the receiving unit is further configured to receive a first hot plug command, where the first hot plug command includes an identifier of the virtual disk. The device further includes a creating unit, configured to create a corresponding virtual disk according to the first hot plug command, and then establish a mapping relationship between the identifier of the newly created virtual disk and the identifier of the newly inserted logical device by using the establishing unit. . After the virtual disk is deleted, the logical device corresponding to the virtual disk is newly inserted.

In some implementations of the second aspect, when a repaired logical device or another new logical device needs to be inserted, the mapping relationship between the identifier of the virtual logical disk and the identifier of the simulated logical device has not been deleted. The receiving unit is further configured to receive a second hot plug command, where the second hot plug command includes an identifier of the first virtual disk and an identifier of the logical device to be inserted. The deleting unit is further configured to delete a mapping relationship between the identifier of the first virtual disk and the identifier of the simulated logical device. The establishing unit is further configured to establish a mapping relationship between the identifier of the first virtual disk and the identifier of the logical device. Some embodiments in the first aspect can be implemented by the device.

In the embodiment of the present invention, a virtual logical device is introduced into the VMM. When a hot swap operation is required, the mapping between the virtual logical device and the virtual disk is replaced by the mapping between the virtual logical device and the virtual disk. The virtual logical device responds to the operation request of the VM to the logical device. Therefore, even if the logical device fails, the hot swapping of the faulty device does not affect the normal operation of the VM, thereby improving the hot plugging technology of the virtual machine.

DRAWINGS

1 is a schematic structural diagram of an operation system according to an embodiment of the present invention;

2 is a schematic diagram of a virtual machine-based device hot replacement device according to an embodiment of the present invention;

FIG. 3 is a flowchart of a virtual machine-based device hot replacement method according to an embodiment of the present invention;

4 is a schematic diagram of mapping relationship from a VM to a physical hardware layer;

FIG. 5 is a schematic diagram of a mapping relationship between a deleted analog logical device and a virtual disk;

FIG. 6 is a flowchart of an alternative operation according to an embodiment of the present invention;

FIG. 7 is a flowchart of an extraction operation according to an embodiment of the present invention;

FIG. 8 is a flowchart of a method for replacing a device based on a virtual machine according to another embodiment of the present invention;

FIG. 9 is a schematic diagram of a mapping relationship between a repaired logical device and a virtual disk;

FIG. 10 is a flowchart of operations for inserting a repaired logic device according to an embodiment of the present invention.

detailed description

The technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the drawings in the embodiments of the present invention. It is a partial embodiment of the invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

FIG. 1 is a schematic structural diagram of an operation system according to an embodiment of the present invention. 1 illustrates an embodiment of the present invention that can be applied to a computer/computer cluster 100 capable of running a virtual machine, such as a server terminal device, a client terminal device, a personal computer, and the like. Such computer/computer cluster 100 may generally include one or more processors 101, one or more memories 102, and one or more physical disks 103/104. Among them, each module is connected through the system bus.

A virtual machine monitor 200, and one or more virtual machines 300/400, may be running on the computer/computer cluster 100. Among them, the virtual machine 300/400 is managed and scheduled by the virtual machine monitor 200. The virtual machine 300/400 may be a virtual machine of a LINUX system, a UNIX system, a WINDOWS system, an ANDROID system, an IOS system, or the like, and the virtual machine 300 and the virtual machine 400 may be virtual machines of different system types. In addition, the virtual machine 300/400 and the virtual machine monitor 200 can also run on a LINUX system, a UNIX system, a WINDOWS system, an ANDROID system, an IOS system, and the like.

In the embodiment of the present invention, the common proxy device object is pre-created in the VMM (for example, the virtual machine monitor 200 in FIG. 2), and the mapping between the public proxy device object and the virtual disk is used instead of the real device and the virtual disk. Mapping, when a hot plug operation is required, responding to a hot plug command from a VM (for example, virtual machine 300/400 in Figure 2) through a common proxy device, thereby realizing that even if the real device fails, the VMM remains Ability to handle hot-swap commands from VMs for hot-swap operations on VMs.

In order to facilitate the understanding of the embodiments of the present invention, the embodiments of the present invention are not to be construed as limiting.

FIG. 3 is a flowchart of a method for replacing a device based on a virtual machine according to an embodiment of the present invention. As shown in Figure 3, the following steps are required:

S310. Receive a hot replacement command.

It should be noted that FIG. 4 is a schematic diagram of a mapping relationship between a VM and a physical hardware layer. As shown in Figure 4, each device seen in the VM (device 1 in VM2 or device 2 in VMn 2) is a virtual disk emulated by VMM (virtual disk 1, virtual disk 2, virtual disk 3). ). Each virtual disk in the VMM corresponds to one logical device in the VMM (virtual disk 1 corresponds to logical device 1; virtual disk 2 corresponds to logical device 2, and virtual disk 3 corresponds to logical device 2), and each logic seen in the VMM The devices are the corresponding physical disks (logical device 1 is physical disk 1; logical device 2 is physical disk 2). In addition, depending on the settings of the virtual machine, one virtual disk can also correspond to one or more logical devices. It should be noted that the physical disk mentioned here is only a simple description. The physical disk may be a disk partition in the operating system, a different storage device, or a block device, such as a keyboard.

In the VMM, the mapping between the virtual disk and the logical device is released, the related resources are reclaimed, and the power of the real device is turned off. At the physical hardware layer, the physical disk is inserted and removed.

In the specific implementation process of the embodiment of the present invention, when the device needs to be hot swapped, the VMM can usually pass through a CLI or a GUI (Graphical User Interface). The human machine operation portal receives the device replacement request, and the request generally carries the identifier of the target virtual disk corresponding to the logical device that needs to be replaced.

It should be known that the specific device can be determined by the identification of the device, and it is obvious that the specific target virtual disk can also be determined by the identity of the target virtual disk.

S320, generating an analog logic device.

It should be noted that the so-called analog logic device may be a set of instructions, which can respond to the processing operation request of the VM to the device, but reject the normal I/O read/write request; or may be a file of the VMM layer, and the function of the file Equivalent to files generated by the file system. The analog logic module generation program may be set in advance at the VMM layer, and after receiving the hot replacement command, the modified program may be triggered to generate an analog logic module. Here, the description of the proxy device object is exemplified, and there are various specific implementation forms, which are not repeated here.

In an embodiment of the present invention, the analog logic device has an identifier, which may be a file descriptor (the VM is based on a UNIX system, accesses a file through a file descriptor), and may also be a file handle (the VM is based on the Windows system). , identify the file by file handle).

S330. Send control information of the logic device to the analog logic device.

It should be noted that the control information of the logical device that needs to be replaced may be inherited by the identifier of the analog logical device, and the control information generally includes: the number of disk sectors, the disk sector size, the device ID, the disk type, and the like. At this point, the analog logic device has the characteristics of the logical device.

S340. Delete a mapping relationship between the identifier of the virtual disk and the identifier of the logical device to be replaced.

It should be noted that, as shown in FIG. 4, if it is determined that the identifier of the virtual disk carried in the hot replacement command corresponds to the virtual disk 401, the mapping relationship between the virtual disk 401 and the logical device 402 is deleted after the analog logical device 403 is established. .

S350. Establish a mapping relationship between the identifier of the virtual disk and the identifier of the analog logical device.

It is noted that, as shown in FIG. 4, the analog logic device can respond to the control information of the virtual disk to the logical device, so the mapping relationship between the analog logical device 403 and the virtual disk 401 is established. Mapping. Simulated by steps S340 and S350 The logical device 403 replaces the failed logical device 402. At this time, the virtual disk 401 corresponding to the device seen at the VM level is normal, and the VM does not know that a replacement process has occurred at the VMM layer. Since the mapping between the logical device and the virtual disk has been disconnected, the interaction between the VM and the logical device at this time is actually the interaction between the VM and the analog logical device.

S360, receiving a hot pull command.

It should be noted that, as shown in FIG. 4, after the step S350, due to the interaction of the VM with the logical device, the interaction between the VM and the analog logical device is actually performed. However, the analog logic device may only be able to respond to the control command and cannot read or write it, that is, the virtual disk 401 has no practical effect, so it can be deleted. The triggering condition for deleting the virtual disk 401 may be that the action is triggered after the S350 is executed, or after the specific hot-plug command is received, the hot-plug command carries the identifier of the virtual disk that needs to be extracted. There are a plurality of operations for triggering the deletion of the virtual disk, which are merely examples and are not limited.

In addition, hot pull commands can be received via the CLI or GUI.

S370, reclaiming resources allocated to the virtual disk.

It should be noted that, since the virtual disk occupies a certain resource of the VMM, as shown in FIG. 5, the VMM needs to recycle the resources allocated to the virtual disk for deleting the virtual disk.

S380: Delete a mapping relationship between the identifier of the virtual disk and the identifier of the simulated logical device.

It should be noted that FIG. 5 is a schematic diagram of a mapping relationship between a deleted analog logical device and a virtual disk. As shown in Figure 5, the analog logical device can also be deleted because the virtual disk has been deleted. When there are new requirements, re-establish the analog logic device.

In addition, as shown in FIG. 4, after the S350 is executed, the logical device 402 can be extracted, that is, the physical disk 410 of the physical hardware layer is pulled out. This step is an optional step. The physical disk 410 is pulled out to repair the failed physical disk 410, or replace it with a good physical disk, or just delete it and no longer use it.

It should be noted that, when the physical disk 410 has been repaired and needs to be re-inserted, the mapping may be re-established if the identifier of the logical device corresponding to the physical disk 410 has not changed. With The body can do the following steps.

A hot plug command is received, the first hot plug command including an identification of a virtual disk to be mapped. Create this virtual disk that needs to be mapped. Establish a mapping relationship between the ID of the newly created virtual disk and the ID of the newly inserted logical device. Since the identifier of the repaired logical device does not change, the identifier of the newly inserted logical device is the identifier of the originally replaced logical device.

In addition, the device that is extracted by the method in the embodiment of the present invention may be only for the faulty device, or may be a normal device.

In one example, as shown in FIG. 4, it is assumed that the physical disk 410 is faulty (the head failure in the conventional mechanical hard disk causes the physical disk 410 to be inaccessible); since the logical device 402 in the VMM is connected through the device driver The physical disk 410, so the logical device 402 also fails; further the virtual disk 401 fails; the virtual disk 401 fails. The final VM is used to drive the device driver failure of the virtual disk 401; thereby causing the application in the VM that needs access to the device to not work properly.

FIG. 6 is a flowchart of an alternative operation according to an embodiment of the present invention. As shown in FIG. 6, if the logical device 402 needs to be hot-replaced without shutting down the VM so that the VM can access the virtual disk 401, the following steps can be performed:

S501. The user mode triggers a device replacement operation in the CLI. The user inputs the following parameters: <VM: Id, virtual disk: Id, operation type: replace>.

S502: The CLI directly forwards the device replacement request to the HAL (Hard Adapter Layer).

S503, the HAL establishes an analog logic device 403 having the identifier: proxy_dev_fd.

S504. The identifier proxy_dev_fd of the analog logic device 403 inherits the control information and status of the virtual disk 401 associated with the logical device 402: the number of disk sectors, the disk sector size, the device ID, and the disk type.

S505. The HAL disconnects the mapping relationship between the identifier of the logical device 402 and the identifier of the virtual disk 401.

S506, the HAL establishes a mapping relationship between the identifier of the analog logic device 403 and the identifier of the virtual disk 401. system.

S507, returning the execution result.

Through the above operations, the analog logic device 403 is allowed to take control operation commands from the virtual disk 401, and when the logical device 402 is hot swapped, the operation of the VM is not affected.

FIG. 7 is a flowchart of an extraction operation according to an embodiment of the present invention. As shown in FIG. 7, when the virtual disk 401 needs to be unplugged, the following steps can also be performed.

S701, the user triggers the hot pull operation through the CLI, and the user inputs the following parameters: <VM: Id, virtual disk 401: Id, operation type: hot-unplug (extract)>.

S702. The CLI forwards the hot pull request to the HAL.

S703, the HAL here submits the request to the EH (Event Handler).

S704, the EH finds the corresponding VM according to the VM Id, and then sends the request <virtual disk 401: Id, operation type: hot-unplug> to the HP (hp driver, hot plug drive) in the VM through the shared page mode.

S705, the HP finds its corresponding device driver according to the Id of the virtual disk 401, and then forwards the request <virtual disk 401, operation type: hot-unplug> to the device driver.

S706. The device driver processing hot pull operation request of the VM: 1) releasing the mapping relationship between the virtual disk 401 and the device seen in the VM; 2) releasing and reclaiming the resources allocated to the virtual disk 401.

S707, the device driver of the VM requests the VMM to power off the virtual disk 401.

S708. The HAL in the VMM releases the mapping relationship between the identifier of the virtual disk 401 and the identifier of the simulated logical device 403.

S709, the HAL closes the analog logic device 403 and recovers related resources.

S710, the HAL returns an execution result to the CLI.

In summary, the embodiment of the present invention introduces a proxy device object in the VMM. When a hot swap operation is required, the mapping between the real device and the virtual disk that needs to be hot swapped is replaced by the mapping between the proxy device object and the virtual disk. The proxy device object responds to the VM's operation request for the real device, so even if the real device fails, the faulty device is hot swapped without affecting the VM. Work properly, thus making the virtual machine hot plug technology.

FIG. 8 is a flowchart of a method for replacing a device based on a virtual machine according to another embodiment of the present invention. As shown in FIG. 6, in another embodiment, after performing step S350 in the foregoing embodiment, the mapping relationship between the identifier of the virtual disk and the identifier of the simulated logical device, and the resource allocated to the virtual disk may not be deleted. On the basis of the foregoing embodiments, the following steps are also required in this embodiment:

S860, receiving a hot insertion command.

It should be noted that, when the logical device needs to be reinserted into the repaired logical device, the identifier of the logical device has changed, or the new logical device is inserted to replace the originally extracted logical device, the VMM can receive through the CLI or the GUI. A hot-plug request carrying the identity of the virtual disk and the identity of the newly inserted logical device.

S870: Delete a mapping relationship between the identifier of the virtual disk and the identifier of the simulated logical device.

After the step S350 is performed, the virtual disk is still visible through the device driver in the VM, and the mapping relationship between the VMM and the analog logical device still exists, and the analog logical device replaces the logical device to be replaced. . Therefore, the corresponding virtual device and the logical device can be determined by the identifier of the virtual disk carried in the hot insertion request and the identifier of the newly inserted logical device; and the analog logical device is replaced with the newly inserted logical device. First, you need to delete the mapping relationship between the ID of the virtual disk and the ID of the simulated logical device.

S880: Establish a mapping relationship between the identifier of the virtual disk and the identifier of the logical device.

It should be noted that in this process, the analog logic device is a transitional device, providing time, and technical support for repairing the failed logical device or replacing the new logical device. And this process is relatively transparent to the VM, that is, it does not affect the normal operation of the VM.

In another example, FIG. 9 is a schematic diagram of a mapping relationship between a repaired logical device and a virtual disk. On the basis of the foregoing example, after the logical device is replaced, the VMM also stores the mapping relationship between the virtual disk and the analog logical device, and the resources allocated to the virtual disk. Without shutting down the VM and the VMM, FIG. 10 The flowchart of the operation of inserting the repaired logic device provided by the embodiment of the present invention. Such as As shown in Figure 10, the process of inserting the repaired logical device requires the following steps:

S901: The user triggers a hot plug operation through the CLI, and the user inputs the following parameters: <VM: Id, virtual disk: Id, logical device: drive letter, operation type: hot-plug (hot plug)>.

S902. The CLI forwards the request to the HAL.

S903 and HAL delete the mapping relationship between the analog logical device and the virtual disk.

S904. The HAL establishes a mapping relationship between the restored logical device and the virtual disk.

S905. The HAL recovers related resources allocated to the analog logic device, and deletes the analog logic device.

S906, HAL returns the execution result.

Through the above steps, hot swapping of the failed logical device is achieved, and is transparent to the VM.

In summary, the embodiment of the present invention realizes that the hot plug operation of the logical device is transparent with respect to the VM by simulating the mapping between the mapping between the logical device and the virtual disk and the mapping between the logical device and the virtual disk in the VMM, thereby When the logical device fails, the VM can be unplugged, repaired, and inserted without shutting down the VM and without affecting the normal operation of the VM, thereby making the virtual machine-based hot plugging technology more perfect.

In summary, the method provided by the embodiment of the present invention introduces an analog logic device in a VMM. When a hot swap operation is required, the logical device and the virtual disk that need to be hot swapped are replaced by mapping the logical device to the virtual disk. Mapping, using the analog logic device to respond to the VM's operational commands to the logical device, so even if the logical device fails, then hot-plugging (hot swapping) the failed device does not affect the normal operation of the VM, thereby making the virtual machine Hot swap technology is more practical.

In a specific implementation process, the hot swap (hot swap) operation of the logical device may be transparent with respect to the VM, so that when the logical device fails, the VM may not be shut down and the VM is not affected. In normal operation, the faulty device is pulled out, repaired, and inserted; even if the logical device fails, the virtual device can be hot swapped in the VM, and the VM and VMM are allocated to the resource of the device. Release, so that the virtual machine's hot swap technology is more complete, able to cope with more needs.

FIG. 2 is a schematic diagram of a virtual machine-based device hot replacement device according to an embodiment of the present invention. The device is mainly used to implement the foregoing virtual machine-based hot replacement method. As shown in FIG. 2, the device may include a virtual machine monitor 200. The virtual machine monitor 200 may specifically include:

The receiving unit 201 is configured to receive a hot replacement command, where the hot replacement command includes an identifier of the virtual disk, where the virtual disk corresponds to a logical device to be replaced;

a generating unit 202, configured to generate an analog logic device, where the analog logic device has an identifier;

The sending unit 203 is configured to send control information of the logical device to be replaced to the analog logic device;

The deleting unit 204 is configured to delete a mapping relationship between an identifier of the first virtual disk and an identifier of the logical device to be replaced.

The establishing unit 205 is configured to establish a mapping relationship between the identifier of the first virtual disk and the identifier of the analog logical device, so that the analog logic device responds to the control instruction for the first virtual disk according to the control information.

In another implementation manner, the embodiment of the present invention may further include:

The recycling unit 206 is configured to: after establishing a mapping relationship between the identifier of the virtual disk and the identifier of the simulated logical device, recover the resource allocated to the virtual disk;

The deleting unit 204 is further configured to delete a mapping relationship between the identifier of the virtual disk and the identifier of the simulated logical device.

Further, in order to implement the re-insertion of the virtual disk, the embodiment of the present invention is in the specific implementation process:

The receiving unit 201 is further configured to receive a hot plug command, where the hot plug command includes an identifier of the newly inserted virtual disk;

A storage unit 207 may also be included for creating a newly inserted virtual disk;

The establishing unit 205 is further configured to establish a mapping relationship between the identifier of the newly inserted virtual disk and the identifier of the replacement logical device.

Specifically, the generating unit 202, the sending unit 203, the deleting unit 204, and the establishing unit 205 may be implemented by a hardware emulation layer HAL, and the hardware emulation layer may further include a reclaiming unit 206. And/or create unit 207. The receiving unit 201 can be implemented by a user interface (CLI or GUI). Further, the virtual machine monitor 200 may further include an event processing module 220 for triggering a hot plug event. In addition, a shared page can be included for interaction with the virtual machine.

A person skilled in the art should further appreciate that the elements and algorithm steps of the various examples described in connection with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of both, in order to clearly illustrate hardware and software. Interchangeability, the composition and steps of the various examples have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the solution. A person skilled in the art can use different methods for implementing the described functions for each particular application, but such implementation should not be considered to be beyond the scope of the present invention.

The steps of a method or algorithm described in connection with the embodiments disclosed herein can be implemented in hardware, a software module executed by a processor, or a combination of both. The software module can be placed in random access memory (RAM), memory, read only memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, removable disk, CD-ROM, or technical field. Any other form of storage medium known.

The specific embodiments of the present invention have been described in detail with reference to the preferred embodiments of the present invention. All modifications, equivalent substitutions, improvements, etc., made within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims

A virtual machine-based device hot replacement method, the method comprising:

Receiving a hot replacement command, where the hot replacement command includes an identifier of the first virtual disk, and the first virtual disk corresponds to a logical device to be replaced;

Generating an analog logic device having an identification;

Sending control information of the logical device to be replaced to the analog logic device;

Deleting a mapping relationship between the identifier of the first virtual disk and the identifier of the logical device to be replaced;

Establishing a mapping relationship between the identifier of the first virtual disk and the identifier of the analog logical device, so that the analog logic device responds to the control instruction for the first virtual disk according to the control information.
The device hot replacement method according to claim 1, further comprising:

After the mapping relationship between the identifier of the first virtual disk and the identifier of the simulated logical device is established, recovering resources allocated to the virtual disk;

And deleting a mapping relationship between the identifier of the first virtual disk and the identifier of the simulated logical device.
The device hot replacement method according to claim 2, further comprising: before the recovering the resources allocated to the virtual disk,

Receiving a hot pull command, the hot pull command including an identifier of the first virtual disk.
The device hot replacement method according to claim 2, further comprising:

Receiving a first hot plug command, where the first hot plug command includes an identifier of the second virtual disk;

Creating the to-be-second virtual disk;

Establishing a mapping relationship between the identifier of the second virtual disk and the identifier of the generation replacement logical device.
The device hot replacement method according to any one of claims 1 to 4, wherein the logical device to be replaced is a faulty logical device.
The device hot replacement method according to claim 5, wherein when the logical device to be inserted needs to be inserted, the logical device to be inserted is a new logical device or a repaired replacement different from the logical device replaced by the substitute The logical device is changed, and the method further includes:

Receiving a second hot plug command, where the second hot plug command includes an identifier of the first virtual disk and an identifier of the logical device to be inserted;

Deleting a mapping relationship between the identifier of the first virtual disk and the identifier of the simulated logical device;

Establishing a mapping relationship between the identifier of the first virtual disk and the identifier of the logical device.
A virtual machine-based device heat replacement device, characterized in that the device comprises:

a receiving unit, configured to receive a hot replacement command, where the hot replacement command includes an identifier of the first virtual disk, where the first virtual disk corresponds to a logical device to be replaced;

a generating unit, configured to generate an analog logic device, where the analog logic device has an identifier;

a sending unit, configured to send control information of the logical device to be replaced to the analog logic device;

a deleting unit, configured to delete a mapping relationship between an identifier of the first virtual disk and an identifier of the logical device to be replaced;

a establishing unit, configured to establish a mapping relationship between the identifier of the first virtual disk and the identifier of the analog logical device, so that the analog logic device responds to the control instruction for the first virtual disk according to the control information .
The device thermal replacement device according to claim 7, further comprising:

a recycling unit, configured to reclaim resources allocated to the virtual disk after establishing the mapping relationship between the identifier of the first virtual disk and the identifier of the simulated logical device;

The deleting unit is further configured to delete a mapping relationship between an identifier of the first virtual disk and an identifier of the analog logical device.
The device thermal replacement device according to claim 8, further comprising:

The receiving unit is further configured to receive a first hot plug command, where the first hot plug command includes The identifier of the second virtual disk;

Creating a unit, configured to create the to-be-second virtual disk;

The establishing unit is further configured to establish a mapping relationship between an identifier of the second virtual disk and an identifier of the generation replacement logical device.
The device hot swap device according to claim 7 or 8, wherein when the logical device to be inserted needs to be inserted, the logical device to be inserted is a new logical device that is different from the logical device replaced by the substitute or has been repaired. Generation of replacement logic devices,

The receiving unit is further configured to receive a second hot plug command, where the second hot plug command includes an identifier of the first virtual disk and an identifier of the logical device to be inserted;

The deleting unit is further configured to delete a mapping relationship between an identifier of the first virtual disk and an identifier of the analog logical device;

The establishing unit is further configured to establish a mapping relationship between the identifier of the first virtual disk and the identifier of the logical device.