HIGH AVAILABILITY SUPPORT FOR VIRTUAL MACHINES

• US 20100325471A1
• Filed: 06/17/2009
• Published: 12/23/2010
• Est. Priority Date: 06/17/2009
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Shankar, Ravi A., Mishra, Rajeev, Russell, Lance Warren
• Granted Patent: US 8,135,985 B2
• Time in Patent Office: Days
• US Class Current: 714/3
• CPC Class Codes: G06F 11/1438 Restarting or rejuvenating
• CPC Class Codes: G06F 11/1484 involving virtual machines
• CPC Class Codes: G06F 11/203 using migration
• CPC Class Codes: G06F 11/2035 without idle spare hardware

Abstract

A computer implemented method, a tangible computer storage medium, and a data processing system provide high availability support for virtual machines in a logical partitioned platform. A monitoring system detect a failure in the virtual machine. Partition management firmware then restarts the virtual machine in a consistency failover image node utilizing a consistency failover image. If a subsequent failure of the virtual machine is detected within a predetermined time, partition management firmware restarts the virtual machine in a boot failover image node utilizing a boot failover image.

Claims

1. A computer implemented method for providing failover support for virtual machines in a logical partitioned platform, the method comprising the computer implemented steps of:

detecting, with a monitoring system, a first failure in a virtual machine in the logical partition platform;

responsive to detecting the failure in the virtual machine, restarting with a partition management firmware the virtual machine in a consistency failover image node utilizing a consistency failover image; and

responsive to identifying a subsequent failure of the virtual machine within a predetermined time, restarting with a partition management firmware the virtual machine in a boot failover image node utilizing a boot failover image.

2. The computer implemented method of claim 1, the computer implemented method further comprising:

responsive to detecting the failure in the virtual machine, restarting the virtual machine in the consistency failover image node utilizing the consistency failover image, wherein the consistency failover image is a first set of files containing contents and structure representing the virtual machine at the time of creation of the consistency failover image; and

responsive to identifying the subsequent failure of the virtual machine within the predetermined time, restarting the virtual machine in a boot failover image node utilizing the boot failover image, wherein the boot failover image is a second file containing contents and structure representing the virtual machine at the time of startup of the virtual machine.

3. The computer implemented method of claim 2, wherein the consistency failover image is a set of consistency failover images, the computer implemented method further comprising:

periodically generating one of the set of consistency failover images, wherein each subsequent image of the set of consistency failover images includes changes to a file system of the virtual machine and changes to a memory of the virtual machine, the changes being made since a generation of a previous subsequent image of the set of consistency failover images.

4. The computer implemented method of claim 3, wherein the step of restarting the virtual machine in a consistency failover image node utilizing a consistency failover image further comprises:

responsive to detecting the failure in the virtual machine, restarting the virtual machine in the consistency failover image node utilizing the set of consistency failover images.

5. The computer implemented method of claim 1, further comprising the computer implemented steps of:

starting the virtual machine; and

responsive to starting the virtual machine, generating the boot failover image, wherein the boot failover image is constructed during the virtual machine boot process before any changeable files are opened by the virtual machine.

6. The computer implemented method of claim 1, wherein the computer implemented step of responsive to identifying the subsequent failure of the virtual machine within the predetermined time, restarting the virtual machine in the boot failover image node utilizing the boot failover image further comprises:

responsive to identifying the subsequent failure of the virtual machine within the predetermined time, restarting the virtual machine in the boot failover image node utilizing the boot failover image, wherein the predetermined time is less than 100 milliseconds.

7. The computer implemented method of claim 1 further comprising the computer implemented steps of:

invoking a recovery routine to synchronize the file system image of the virtual machine, so that the virtual machine maintains a same file system image that was held by the virtual machine prior to the failure.

8. A tangible computer storage medium having a computer program product encoded thereon for providing high availability support for virtual machines in a logical partitioned platform, the tangible computer storage medium comprising:

instructions for detecting a first failure in a virtual machine;

instructions, responsive to detecting the failure in the virtual machine, for restarting the virtual machine in a consistency failover image node utilizing a consistency failover image; and

instructions, responsive to identifying a subsequent failure of the virtual machine within a predetermined time, for restarting the virtual machine in a boot failover image node utilizing a boot failover image.

9. The tangible computer storage medium claim 8 further comprising:

instructions, responsive to detecting the failure in the virtual machine, for restarting the virtual machine in the consistency failover image node utilizing the consistency failover image, wherein the consistency failover image is a first set of files containing contents and structure representing the virtual machine at the time of creation of the consistency failover image; and

instructions, responsive to identifying the subsequent failure of the virtual machine within the predetermined time, for restarting the virtual machine in a boot failover image node utilizing the boot failover image, wherein the boot failover image is a second file containing contents and structure representing the virtual machine at the time of startup of the virtual machine.

10. The tangible computer storage medium of claim 9, wherein the consistency failover image is a set of consistency failover images, the tangible computer storage medium further comprising:

instructions for periodically generating one of the set of consistency failover images, wherein each subsequent image of the set of consistency failover images includes changes to a file system of the virtual machine and changes to a memory of the virtual machine, the changes being made since a generation of a previous subsequent image of the set of consistency failover images.

11. The tangible computer storage medium of claim 10, wherein the instructions for restarting the virtual machine in a consistency failover image node utilizing a consistency failover image further comprises:

instructions, responsive to detecting the failure in the virtual machine, for restarting the virtual machine in a consistency failover image node utilizing the set of consistency failover images.

12. The tangible computer storage medium of claim 8, further comprising:

instructions for starting the virtual machine; and

instructions, responsive to starting the virtual machine, for generating the boot failover image, wherein the boot failover image is constructed during the virtual machine boot process before any changeable files are opened by the virtual machine.

13. The tangible computer storage medium of claim 8, wherein the instructions responsive to identifying a subsequent failure of the virtual machine within the predetermined time, for restarting the virtual machine in the boot failover image node utilizing the boot failover image further comprises:

instructions, responsive to identifying a subsequent failure of the virtual machine within a predetermined time, for restarting the virtual machine in a boot failover image node utilizing a boot failover image, wherein the predetermined time is less than 100 milliseconds.

14. The tangible computer storage medium of claim 8 further comprising:

instructions for invoking a recovery routine to synchronize the file system image of the virtual machine, so that the virtual machine maintains a same file system image that was held by the virtual machine prior to the failure.

15. A data processing system comprising:

a storage device having computer usable program code encoded thereon for providing high availability support for virtual machines in a logical partitioned platform;

a bus system connecting the storage device to a processor; and

a processor, wherein the processor executes the computer usable program to detect a first failure in a virtual machine;

responsive to detecting the failure in the virtual machine, to restart the virtual machine in a consistency failover image node utilizing a consistency failover image; and

responsive to identifying a subsequent failure of the virtual machine within a predetermined time, to restart the virtual machine in a boot failover image node utilizing a boot failover image.

16. The data processing system of claim 15, wherein the processor further executes the computer usable program code:

responsive to detecting the failure in the virtual machine, to restart the virtual machine in the consistency failover image node utilizing the consistency failover image, wherein the consistency failover image is a first set of files containing contents and structure representing the virtual machine at the time of creation of the consistency failover image; and

responsive to identifying the subsequent failure of the virtual machine within the predetermined time, to restart the virtual machine in a boot failover image node utilizing the boot failover image, wherein the boot failover image is a second file containing contents and structure representing the virtual machine at the time of startup of the virtual machine.

17. The data processing system of claim 16, wherein the consistency failover image is a set of consistency failover images, wherein the processor further executes the computer usable program code:

to periodically generate one of the set of consistency failover images, wherein each subsequent image of the set of consistency failover images includes changes to a file system of the virtual machine and changes to a memory of the virtual machine, the changes being made since a generation of a previous subsequent image of the set of consistency failover images.

18. The data processing system of claim 17, wherein the computer usable program code to restart the virtual machine in a consistency failover image node utilizing a consistency failover image further comprises computer usable program code:

responsive to detecting the failure in the virtual machine, to restart the virtual machine in a consistency failover image node utilizing the set of consistency failover images.

19. The data processing system of claim 15, wherein the processor further executes the computer usable program code:

to start the virtual machine; and

responsive to starting the virtual machine, to generate the boot failover image, wherein the boot failover image is constructed during the virtual machine boot process before any changeable files are opened by the virtual machine.

20. The data processing system of claim 15, wherein the computer usable program code responsive to identifying a subsequent failure of the virtual machine within the predetermined time, to restart the virtual machine in the boot failover image node utilizing the boot failover image further comprises computer usable program code:

responsive to identifying the subsequent failure of the virtual machine within the predetermined time, to restart the virtual machine in the boot failover image node utilizing the boot failover image, wherein the predetermined time is less than 100 milliseconds.

21. The data processing system of claim 15 wherein the processor further executes the computer usable program code:

to invoke a recovery routine to synchronize the file system image of the virtual machine, so that the virtual machine maintains a same file system image that was held by the virtual machine prior to the failure.