Techniques for recovering a virtual machine

• US 9,697,093 B2
• Filed: 09/05/2012
• Issued: 07/04/2017
• Est. Priority Date: 09/05/2012
• Status: Active Grant

• Current Assignee: Veritas Technologies, LLC (Whitehouse Group Ltd.)
• Original Assignee: Veritas Technologies, LLC (Whitehouse Group Ltd.)
• Inventors: Jorapurkar, Girish Sureshrao, Makin, Gaurav, Nguyen, Sinh Dang
• Primary Examiner(s): Uddin, Md. I
• Application Number:
  US13/604,344
• Publication Number:
  US 20140067763A1
• Time in Patent Office: 1,763 Days
• Field of Search: 707639, 707610, 707674, 707E17007
• CPC Class Codes: G06F 11/1438 Restarting or rejuvenating
• CPC Class Codes: G06F 11/1469 Backup restoration techniques
• CPC Class Codes: G06F 11/1471 involving logging of persistent data for recovery
• CPC Class Codes: G06F 11/1484 involving virtual machines
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data

Abstract

Techniques for recovering a virtual machine are disclosed. In one particular embodiment, the techniques may be realized as a method for recovering a virtual machine comprising the steps of selecting a first backup copy of a virtual machine in a first data store, selecting a second data store; enabling use of the virtual machine by reading from the first data store and writing to the second data store, selecting a second backup copy of the virtual machine, and migrating the virtual machine from the second backup copy to the second data store.

Claims

1. A method for recovering a virtual machine comprising the steps of:

selecting a first backup copy of a virtual machine in a first backup data store configured for read-only random access;

selecting a production data store configured for read-write random access;

enabling use of the virtual machine by reading from the first backup copy in the first backup data store and writing changes for the virtual machine to a redo log in the production data store;

selecting a second backup copy of the virtual machine in a second backup data store configured for read-only sequential access;

copying the virtual machine from the second backup copy to a production copy in the production data store;

incorporating the changes for the virtual machine from the redo log to the production copy of the virtual machine in the production data store; and

modifying a configuration of the virtual machine to refer to the production copy for reads and writes, wherein the virtual machine is temporarily suspended to facilitate modifying the virtual machine configuration, wherein the configuration of the virtual machine comprises a configuration file that includes one or more references to the first backup copy of the virtual machine in the first backup data store, wherein the modification of the configuration of the virtual machine comprises modifying the configuration file such that the one or more references are at least one of removed from the configuration file or disabled.

2. The method of claim 1, wherein the first backup data store is optimized for random access to backup data to be faster than sequential access to the backup data.

3. The method of claim 1, wherein the production data store is optimized for fast read and write access to production data.

4. The method of claim 1, wherein the second backup copy is optimized for sequential access to backup data to be faster than random access to the backup data.

5. The method of claim 1, wherein enabling use of the virtual machine further comprises:

configuring the virtual machine from a configuration stored in the first backup copy;

modifying the configuration to refer to the production data store as a working directory and refer to the first data store for read access; and

modifying the copy of the configuration to refer to the production data store for write access.

6. The method of claim 5, wherein enabling use of the virtual machine further comprises creating a snapshot of the virtual machine.

7. The method of claim 1, wherein copying the virtual machine from the second backup copy to the production data store further comprises incorporating writes written to the redo log in the production data store while the virtual machine is in use.

8. The method of claim 1 further comprising sending a notification when copying the virtual machine is complete or when incorporating the changes for the virtual machine is complete.

9. A system for recovering a virtual machine comprising:

one or more processors communicatively coupled to a network;

wherein the one or more processors are configured to;

select a first backup copy of a virtual machine in a first backup data store configured for read-only random access;

select a production data store configured for read-write random access;

enable use of the virtual machine by reading from the first backup copy in the first backup data store and writing changes for the virtual machine to a redo log in the production data store;

select a second backup copy of the virtual machine in a second backup data store configured for read-only sequential access;

copy the virtual machine from the second backup copy to a production copy in the production data store;

incorporate the changes for the virtual machine from the redo log to the production copy of the virtual machine in the production data store; and

modifying a configuration of the virtual machine to refer to the production copy for reads and writes, wherein the virtual machine is temporarily suspended to facilitate modifying the virtual machine configuration, wherein the configuration of the virtual machine comprises a configuration file that includes one or more references to the first backup copy of the virtual machine in the first backup data store, wherein the modification of the configuration of the virtual machine comprises modifying the configuration file such that the one or more references are at least one of removed from the configuration file or disabled.

10. The system of claim 9, wherein the first backup data store is optimized for random access to backup data to be faster than sequential access to the backup data.

11. The system of claim 9, wherein the second backup copy is optimized for sequential access to backup data to be faster than random access to the backup data.

12. The system of claim 9, wherein the one or more processors are further configured to:

configure the virtual machine from a configuration of the virtual machine from the first backup data store to the second data store;

modify the copy of the configuration to refer to the production data store as a working directory and refer to the first backup data store for read access; and

modify the copy of the configuration to refer to the production data store for write access.

13. The system of claim 12, wherein the one or more processors, configured to copy the virtual machine from the second backup copy to the second data store, are further configured to incorporate writes written to the production data store while the virtual machine is in use.

14. The system of claim 9, wherein the one or more processors are further configured to send a notification when copying the virtual machine is complete or when incorporating the changes for the virtual machine is complete.

15. An article of manufacture for recovering a virtual machine, the article of manufacture comprising:

at least one non-transitory processor readable storage medium; and

instructions stored on the at least one medium;

wherein the instructions are configured to be readable from the at least one medium by at least one processor and thereby cause the at least one processor to operate so as to;

select a first backup copy of a virtual machine in a first backup data store configured for read-only random access;

select a production data store configured for read-write random access;

enable use of the virtual machine by reading from the first backup copy in the first backup data store and writing changes for the virtual machine to a redo log in the production data store;

select a second backup copy of the virtual machine in a second backup data store configured for read-only sequential access;

copy the virtual machine from the second backup copy to a production copy in the production data store;

incorporate the changes for the virtual machine from the redo log to the production copy of the virtual machine in the production data store; and

modifying a configuration of the virtual machine to refer to the production copy for reads and writes, wherein the virtual machine is temporarily suspended to facilitate modifying the virtual machine configuration, wherein the configuration of the virtual machine comprises a configuration file that includes one or more references to the first backup copy of the virtual machine in the first backup data store, wherein the modification of the configuration of the virtual machine comprises modifying the configuration file such that the one or more references are at least one of removed from the configuration file or disabled.

16. The article of manufacture of claim 15, wherein the first backup data store is optimized for random access to backup data to be faster than sequential access to the backup data.

17. The article of manufacture of claim 15, wherein the second backup copy is optimized for sequential access to backup data to be faster than random access to the backup data.

18. The article of manufacture of claim 15, wherein the instructions cause the at least one processor to operate further so as to:

configure the virtual machine from a configuration of the virtual machine from the first backup data store to the second data store;

modify the copy of the configuration to refer to the production data store as a working directory and refer to the first backup data store for read access; and

modify the copy of the configuration to refer to the production data store for write access.

19. The article of manufacture of claim 15, wherein the at least one processors, caused to operate so as to copy the virtual machine from the second backup copy to a production copy in the production data store, is caused to operate further so as to incorporate writes written to the second data store while the virtual machine is in use.

20. The article of manufacture of claim 15, wherein the instructions cause the at least one processor to operate further so as to send a notification when copying the virtual machine is complete or when incorporating the changes for the virtual machine is complete.