Systems and methods of unified reconstruction in storage systems

Patent metadata

Field	Value
Publication number	US-9633064-B2
Application number	US-201414455201-A
Country	US
Kind code	B2
Filing date	Aug 8, 2014
Priority date	Dec 19, 2005
Publication date	Apr 25, 2017
Grant date	Apr 25, 2017

Abstract

Systems and methods for reconstructing unified data in an electronic storage network are provided which may include the identification and use of metadata stored centrally within the system. The metadata may be generated by a group of storage operation cells during storage operations within the network. The unified metadata is used to reconstruct data throughout the storage operation cells that may be missing, deleted or corrupt.

First claim

What is claimed is:

1. A system for maintaining metadata in an electronic storage network comprising:
primary data stored on at least a first storage device;
at least a first and second media agents that create at least secondary copies of first and second portions of the primary data on at least a second storage device, the first media agent creates a first set of metadata that is stored in a first metadata storage device, and the second media agent creates a second set of metadata that is stored in a second metadata storage device;
a centralized metadata storage device that stores at least a copy of the first set of metadata and a copy of the second set of metadata, wherein the centralized metadata storage device is different than the first and second metadata storage devices; and
at least one storage management component that:
associates the first media agent with the copy of the first set of metadata stored in the centralized metadata storage device;
associates the second media agent with the copy of the second set of metadata stored in the centralized metadata storage device; and
reconstructs a loss of the portion of the first set of metadata on the first metadata storage device using the copy of the first set of metadata stored on the centralized metadata storage device based on the association of the copy of the first set of metadata with the first media agent.

2. The system of claim 1 wherein the copies of the first and second set of metadata stored on the centralized metadata storage device are copied to a third storage device.

3. The system of claim 1 wherein the storage management component identifies portions of metadata stored in different locations.

4. The system of claim 1 wherein the storage management component determines that at least a portion of the first set of metadata is missing.

5. The system of claim 1 wherein the storage management component analyzes a missing portion of the first set of metadata to determine whether the missing portion may be reconstructed.

6. The system of claim 5 wherein the storage management component determines whether the missing portion may be reconstructed based at least in part whether metadata associated with one or more storage operations has been identified.

7. The system of claim 1 wherein the storage management component determines that a missing portion of the first set of metadata exists in the centralized metadata storage device based on an identifier associated with the first media agent.

8. The system of claim 7 wherein the storage management component sends a reconstruction of the missing portion of the first set of metadata to the first media agent.

9. The system of claim 1 wherein the storage management component determines that a missing portion of the first set of metadata exists in the centralized metadata storage device based on an identifier associated with the first storage device.

10. The system of claim 1 wherein the storage management component reconstructs a loss of the portion of the second set of metadata on the second metadata storage device using the copy of the second set of metadata stored on the centralized metadata storage device based on the association of the copy of the second set of metadata with the second media agent.

11. A method for maintaining and restoring metadata in an electronic storage network which includes a client computer networked to at least another client computer or a server, comprising:
copying with at least first and second media agents comprising computer hardware, first and second portions of primary data stored on at least a first storage device to at least a second storage device to create at least secondary copies of the first and second portions of the primary data on the second storage device, wherein a first media agent creates a first set of metadata that is stored in a first metadata storage device, and wherein the second media agent creates a second set of metadata that is stored in a second metadata storage device;
copying the first and second sets of metadata to a centralized metadata storage device to create a copy of the first set of metadata and a copy of the second set of metadata on the centralized metadata storage device, wherein the centralized metadata storage device is different than the first and second metadata storage devices; and
associating the first media agent with the copy of the first set of metadata stored in the centralized storage device;
associating the second media agent with the copy of the second set of metadata stored in the centralized metadata storage device;
reconstructing the loss of the portion of the first set of metadata on the first metadata storage device using the copy of the first set of metadata stored on the centralized metadata storage device based on the association of the copy of the first set of metadata with the first media agent.

12. The method of claim 11 further comprising storing copies of the first and second set of metadata stored on the centralized metadata storage device are copied to a third storage device.

13. The method of claim 11 further comprising identifies portions of metadata stored in different locations.

14. The method of claim 11 further comprising determining that at least a portion of the first set of metadata is missing.

15. The method of claim 11 further comprising analyzing a missing portion of the first set of metadata to determine whether the missing portion may be reconstructed.

16. The method of claim 15 further comprising determining whether the missing portion may be reconstructed based at least in part whether metadata associated with one or more storage operations has been identified.

17. The method of claim 11 further comprising determining that a missing portion of the first set of metadata exists in the centralized metadata storage device based on an identifier associated with the first media agent.

18. The method of claim 17 further comprising sending a reconstruction of the missing portion of the first set of metadata to the first media agent.

19. The method of claim 11 further comprising reconstructing a loss of the portion of the second set of metadata on the second metadata storage device using the copy of the second set of metadata stored on the centralized metadata storage device based on the association of the copy of the second set of metadata with the second media agent.

20. The method of claim 11 further comprising determining that a missing portion of the first set of metadata exists in the centralized metadata storage device based on an identifier associated with the first storage device.

Assignees

• Commvault Systems Inc

Inventors

• Gokhale Parag

Classifications

• G06F17/30194

  Physics · mapped topic

• G06F11/1464

  for networked environments · CPC title

• G06F2201/84

  Using snapshots, i.e. a logical point-in-time copy of the data · CPC title

• G06F11/1469 Primary

  Backup restoration techniques · CPC title

• G06F11/1435

  using file system or storage system metadata · CPC title