SYSTEM AND METHOD TO PERFORM LIVE MIGRATION OF A VIRTUAL MACHINE WITHOUT SUSPENDING OPERATION THEREOF

• US 20170364394A1
• Filed: 06/06/2017
• Published: 12/21/2017
• Est. Priority Date: 06/20/2016
• Status: Active Application

• Current Assignee: Fujitsu Limited
• Original Assignee: Fujitsu Limited
• Inventors: FUJITA, TOMOYA
• Application Number:
  US15/614,929
• Publication Number:
  US 20170364394A1
• Time in Patent Office: Days
• CPC Class Codes: G06F 2009/4557 Distribution of virtual machine instances; Migration and load balancing
• CPC Class Codes: G06F 9/45558 Hypervisor-specific management and integration aspects
• CPC Class Codes: G06F 9/4856 resumption being on a different machine, e.g. task migration, virtual machine migration G06F9/5088 takes precedence
• CPC Class Codes: G06F 9/50 Allocation of resources, e.g. of the central processing unit [CPU]
• CPC Class Codes: G06F 9/5088 involving task migration

Abstract

First and second machines include first and second memories, respectively, and are accessible to a shared memory. The first machine executes copying data stored in the first memory allocated to the virtual machine to the shared memory, and translates a physical address for the virtual machine to access to the data, from an address of the first memory to an address of the shared memory. When copying of all data in the first memory to the shared memory completes and the first machine changes over control of the virtual machine from the first machine to the second machine, the second machine executes copying the data stored in the shared memory to the second memory allocated to the virtual machine, and translates a physical address for the virtual machine to access the data, from an address of the shared memory to an address of the second memory.

Claims

1. A non-transitory, computer-readable recording medium having stored therein a program for causing a computer to execute a process for migrating a virtual machine from a first physical machine to a second physical machine, the process comprising:

copying data stored in a first local memory of the first physical machine allocated to the virtual machine to a shared memory accessible from both of the first physical machine and the second physical machine, while translating a physical address for the virtual machine to access the copied data, from an address of the first local memory to an address of the shared memory;

upon completion of copying all data in the first local memory to the shared memory, changing over control of the virtual machine from the first physical machine to the second physical machine; and

copying data stored in the shared memory to a second local memory of the second physical machine allocated to the virtual machine, while translating a physical address for the virtual machine to access the copied data, from an address of the shared memory to an address of the second local memory.

2. The non-transitory, computer-readable recording medium of claim 1, the process further comprising:

when a write instruction to the data is issued during the copying of the data from the first local memory to the shared memory, suspending execution of the write instruction until the copying of the data to the shared memory completes, and executing the write instruction on the data copied on the shared memory after completion of the copying; and

when a write instruction to the data is issued during the copying of the data from the shared memory to the second local memory, suspending execution of the write instruction until the copying of the data to the second local memory completes, and executing the write instruction on the data copied on the second local memory after completion of the copying.

3. The non-transitory, computer-readable recording medium of claim 1, the process further comprising:

dividing an area of each of the first local memory, the second local memory, and the shared memory allocated to the virtual machine, into a plurality of blocks; and

performing, on a block-by-block basis, the copying of the data from the first local memory to the shared memory, the translating of the physical address from the first local memory to the shared memory, the copying of the data from the shared memory to the second local memory, and the translating of the physical address from the shared memory to the second local memory.

4. The non-transitory, computer-readable recording medium of claim 3, wherein a size of each block is a minimum size manageable by operating systems of the first physical machine and the second physical machine.

5. The non-transitory, computer-readable recording medium of claim 1, wherein the shared memory is provided in a storage area outside the first physical machine and the second physical machine.

6. The non-transitory, computer-readable recording medium of claim 1, wherein the shared memory is provided in a storage area included in the first physical machine or the second physical machine.

7. The non-transitory, computer-readable recording medium of claim 6, wherein

in a case where the shared memory is provided in a storage area included in the first physical machine, a memory token corresponding to the shared memory is set in the first physical machine, and an access token paired with the memory token for access to the shared memory is set in the second physical machine.

8. The non-transitory, computer-readable recording medium of claim 6, wherein

in a case where the shared memory is provided in a storage area included in the second physical machine, a memory token corresponding to the shared memory is set in the second physical machine, and an access token paired with the memory token for access to the shared memory is set in the first physical machine.

9. A system comprising:

a first physical machine including a first local memory and a first processor coupled to the first local memory;

a second physical machine including a second local memory and a second processor coupled to the second local memory; and

a shared memory accessible from both of the first physical machine and the second physical machine, wherein

the first processor of the first physical machine is configured to;

execute processing of copying data stored in the first local memory allocated to the virtual machine to the shared memory, and

translate a physical address for the virtual machine to access to the data copied from the first local memory to the shared memory, from an address of the first local memory to an address of the shared memory;

the second processor of the second physical machine is configured to;

when copying of all data in the first local memory to the shared memory completes and the first physical machine changes over control of the virtual machine from the first physical machine to the second physical machine, execute processing of copying the data stored in the shared memory to the second local memory allocated to the virtual machine, and

translate a physical address for the virtual machine to access the data copied from the shared memory to the second local memory, from an address of the shared memory to an address of the second local memory.

10. The system of claim 9, wherein

the first processor of the first physical machine is configured to, when a write instruction to data is issued during the copying of the data from the first local memory to the shared memory, cause the hypervisor of the first physical machine to suspend execution of the write instruction until the copying of the data into the shared memory completes, and to execute the write instruction on the data copied to the shared memory after completion of the copying;

and

the second processor of the second physical machine is configured to, when a write instruction to the data is issued during the copying of the data from the shared memory to the second local memory, cause the hypervisor of the second physical machine to suspend execution of the write instruction until the copying of the data to the second local memory completes, and execute the write instruction on the data copied to the second local memory after completion of the copying.

11. The system of claim 9, wherein

an area of each of the first local memory, the second local memory, and the shared memory allocated to the virtual machine is divided into a plurality of blocks;

and

the first processor of the first physical machine is configured to, on a block-by-block basis, execute processing of copying of the data from the first local memory to the shared memory, and translate a physical address from the first local memory to the shared memory; and

the second processor of the second physical machine is configured to, on a block-by-block basis, execute the processing of copying of the data from the shared memory to the second local memory, and translate a physical address from the shared memory to the second local memory.

12. The system of claim 11, wherein

the size of each block is a minimum size manageable by operating systems of the first physical machine and the second physical machine.

13. The system of claim 9, wherein

the shared memory is provided in a storage area outside the first physical machine and the second physical machine.

14. The system according of claim 9, wherein

the shared memory is provided in a storage area included in the first physical machine or the second physical machine.

15. The system of claim 14, wherein

in a case where the shared memory is provided in the storage area included in the first physical machine, the first processor sets a memory token corresponding to the shared memory in the first physical machine and transmits an access token paired with the memory token for access to the shared memory to the second physical machine, and the second processor sets the access token transmitted from the first processor in the second physical machine.

16. The system of claim 14, wherein

in a case where the shared memory is provided in the storage area include in the second physical machine, the second processor sets a memory token corresponding to the shared memory in the second physical machine and transmits an access token paired with the memory token for access to the shared memory to the first physical machine, and the first processor sets the access token transmitted from the second control unit in the first physical machine.

17. A method for migrating a virtual machine from a first physical machine to a second physical machine, the method comprising:

copying data stored in a first local memory of the first physical machine allocated to the virtual machine to a shared memory accessible from both of the first physical machine and the second physical machine, while translating a physical address for the virtual machine to access the copied data, from an address of the first local memory to an address of the shared memory;

upon completion of copying all data in the first local memory to the shared memory, changing over control of the virtual machine from the first physical machine to the second physical machine; and

copying data stored in the shared memory to a second local memory of the second physical machine allocated to the virtual machine, while translating a physical address for the virtual machine to access the copied data, from an address of the shared memory to an address of the second local memory.