System and method for performing an image level snapshot and for restoring partial volume data

• US 8,190,565 B2
• Filed: 11/22/2010
• Issued: 05/29/2012
• Est. Priority Date: 11/13/2003
• Status: Active Grant

• Current Assignee: CommVault Systems Incorporated
• Original Assignee: CommVault Systems Incorporated
• Inventors: Prahlad, Anand, Ngo, David, Varadharajan, Prakash, Pawar, Rahual, Kumar, Avinash
• Primary Examiner(s): Corrielus, Jean M
• Application Number:
  US12/951,773
• Publication Number:
  US 20110066599A1
• Time in Patent Office: 554 Days
• Field of Search: 707/610, 707/639, 707/649, 707/646, 707/999.201, 707/999.202, 707/999.204, 707/647, 707/736, 707/741, 707/750, 707/999.003, 707/999.005, 711/162, 711/112, 711/114, 704/9, 715/231
• US Class Current: 707/610
• CPC Class Codes: G06F 11/1435 using file system or storage system metadata
• CPC Class Codes: G06F 11/1446 Point-in-time backing up or restoration of persistent data
• CPC Class Codes: G06F 11/1448 Management of the data involved in backup or backup restore
• CPC Class Codes: G06F 11/1469 Backup restoration techniques
• CPC Class Codes: G06F 16/128 Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion use of snapshots for error detection or correction G06F11/14, G06F11/16
• CPC Class Codes: G06F 16/178 Techniques for file synchronisation in file systems
• CPC Class Codes: G06F 16/1844 Management specifically adapted to replicated file systems
• CPC Class Codes: G06F 16/22 Indexing; Data structures therefor; Storage structures
• CPC Class Codes: G06F 16/285 Clustering or classification
• CPC Class Codes: G06F 16/86 Mapping to a database
• CPC Class Codes: G06F 2201/80 Database-specific techniques
• CPC Class Codes: G06F 2201/805 Real-time
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data
• CPC Class Codes: Y10S 707/99944 Object-oriented database structure
• CPC Class Codes: Y10S 707/99952 Coherency, e.g. same view to multiple users
• CPC Class Codes: Y10S 707/99953 Recoverability
• CPC Class Codes: Y10S 707/99955 Archiving or backup

Abstract

The present invention relates to a method for performing an image level copy of an information store. The present invention comprises performing a snapshot of an information store that indexes the contents of the information store, retrieving data associated with the contents of the information store from a file allocation table, copying the contents of the information store to a storage device based on the snapshot, and associating the retrieved data with the copied contents to provide file system information for the copied contents.

Claims

1. A method for restoring one or more electronic files indexed by one or more snapshots in a computer system, the method comprising:

performing a first snapshot of one or more files in an information store at a first time;

copying the data associated with the first snapshot to at least one storage device that is different than the information store;

performing at least a second snapshot of the one or more files in the information store at a second time;

determining changes in the files that occurred between the first snapshot and the second snapshot;

identifying changed data associated with the changes and storing in the storage device the changed data in association with the second snapshot;

receiving a request to restore to the information store one or more of the files stored in the storage device; and

using the changed data stored in association with the second snapshot to restore at least a portion of the one or more files to the information store.

2. The method of claim 1, wherein the restoring the portion of the one or more files comprises:

restoring the one or more files from the first snapshot; and

replacing portions of the restored one or more files changed after the first snapshot with portions of the one or more files from the second snapshot until the most recent portions of the one or more files are restored.

3. The method of claim 1, wherein the restoring the portion of the one or more files comprises:

restoring one or more portions of the one or more files from a final snapshot; and

restoring a different one or more portions of the one or more files from a previous snapshot.

4. The method of claim 1, further comprising causing to be displayed a list of one or more files that can be restored.

5. The method of claim 1, wherein querying the storage device for one or more snapshots comprises searching a data structure for one or more locations of the one or more snapshots that index the one or more files.

6. An electronic file storage system configured to restore one or more electronic files indexed by one or more snapshots in a computer system, the system comprising:

a storage manager module executing in one or more processors and configured to;

direct performance of a first snapshot of one or more files in an information store at a first time and copy the data associated with the first snapshot to at least one storage device that is different than the information store;

direct performance of at least a second snapshot of the one or more files in the information store at a second time;

determine changes in the files that occurred between the first snapshot and the second snapshot;

identify changed data associated with the changes and store in the storage device the changed data in association with the second snapshot;

receive a request to restore to the information store one or more of the files stored in the storage device;

restore to the information store, at least a portion of the one or more files by using the changed data stored in association with the second snapshot.

7. The system of claim 6, wherein the storage manager module is further configured to:

restore the one or more files from the first snapshot; and

replace portions of the restored one or more files changed after the first snapshot with portions of the one or more files from the second snapshot until the most recent portions of the one or more files are restored.

8. The system of claim 6, wherein the storage manager module is further configured to:

restore one or more portions of the one or more files from a final snapshot; and

restore a different one or more portions of the one or more files from a previous snapshot.

9. The system of claim 6, wherein the storage manager module is further configured to search a data structure for one or more locations of the one or more snapshots that index the one or more files.

10. An electronic file storage system configured to restore one or more files indexed by one or more snapshots, the system comprising:

a storage manager module configured to;

direct performing a first snapshot of one or more files in an information store at a first time and copying the data associated with the first snapshot to at least one storage device that is different than the information store;

direct performing at least a second snapshot of the one or more files in the information store at a second time;

determine changes in the files that occurred between the first snapshot and the second snapshot;

identify changed data associated with the changes and storing in the storage device the change data in association with the second snapshot;

receive a request to restore to the information store one or more files stored in the storage device and

restore to the information store, at least a portion of the one or more files by using the changed data stored in association with the second snapshot.

11. The system of claim 10, wherein the storage manager module is further configured to:

restore the one or more files from the first snapshot;

replace portions of the restored one or more files changed after the first snapshot with portions of the one or more files from the second snapshot until the most recent portions of the one or more files are restored.

12. The system of claim 10, wherein the storage manager module is further configured to:

restore one or more portions of the one or more files from a final snapshot; and

restore a different one or more portions of the one or more files from a previous snapshot.

13. The system of claim 10, wherein the media agent module is further configured to search a data structure for one or more locations of the one or more snapshots that index the one or more files.