Data redistribution in data replication systems

• US 20100246578A1
• Filed: 03/31/2009
• Published: 09/30/2010
• Est. Priority Date: 03/31/2009
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: Data Domain, Inc. (Dell Technologies Inc.)
• Inventors: Zhong, Hua, Moghe, Dheer, Reddy, Sazzala Venkata
• Granted Patent: US 8,325,724 B2
• Time in Patent Office: Days
• US Class Current: 370/390
• CPC Class Codes: G06F 16/27 Replication, distribution or synchronisation of data between databases or within a distributed database system; Distributed database system architectures therefor
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes

Abstract

A system includes one or more processors configured to redistribute one or more originator data subsets among a plurality of originator nodes and determine data redistribution information pertaining to redistribution of the one or more originator data subsets among the plurality of originator nodes. The system further includes a communication interface configured to send data redistribution information to a replica system. The data redistribution information is used by the replica system to redistribute one or more corresponding replica data subsets among a plurality of replica nodes.

Claims

1. A system comprising:

one or more processors configured to;

redistribute one or more originator data subsets among a plurality of originator nodes; and

determine data redistribution information pertaining to redistribution of the one or more originator data subsets among the plurality of originator nodes; and

a communication interface configured to send data redistribution information to a replica system;

wherein

the data redistribution information is used by the replica system to redistribute one or more corresponding replica data subsets among a plurality of replica nodes.

2. The system of claim 1, wherein the data redistribution information includes identification information of one or more previous originator nodes from which the one or more data subsets have been moved, and identification information of one or more current originator nodes on which the originator data subsets currently reside.

3. The system of claim 1, wherein the one or more originator data subsets include one or more data containers.

4. The system of claim 1, wherein the redistribution information includes metadata associated with the one or more data containers.

5. The system of claim 1, wherein the redistribution information includes metadata associated with the one or more data containers, and each of the one or more data containers includes one or more data segments.

6. The system of claim 1, wherein the one or more originator data subsets and the one or more replica data subsets include identical backup data.

7. The system of claim 1, wherein the plurality of originator nodes are included in a file system.

8. The system of claim 1, wherein the data redistribution information does not include backup data.

9. The system of claim 1, wherein the one or more originator data subsets are redistributed from one or more existing nodes to a newly added node.

10. The system of claim 1, wherein the one or more originator data subsets are redistributed to rebalance load on the plurality of originator nodes.

11. A method for data replication, comprising:

redistributing one or more originator data subsets among a plurality of originator nodes; and

determining data redistribution information pertaining to redistribution of the one or more originator data subsets among the plurality of originator nodes; and

sending data redistribution information to a replica system;

wherein

the data redistribution information is used by the replica system to redistribute one or more corresponding replica data subsets among a plurality of replica nodes.

12. The method of claim 11, wherein the data redistribution information includes identification information of one or more previous originator nodes from which the one or more data subsets have been moved, and identification information of one or more current originator nodes on which the originator data subsets currently reside.

13. The method of claim 11, wherein the one or more originator data subsets include one or more data containers.

14. The method of claim 11, wherein the redistribution information includes metadata associated with the one or more data containers.

15. The method of claim 11, wherein the redistribution information includes metadata associated with the one or more data containers, and each of the one or more data containers includes one or more data segments.

16. The method of claim 11, wherein the one or more originator data subsets and the one or more replica data subsets include identical backup data.

17. A computer program product for data replication, the computer program product being embodied in a computer readable storage medium and comprising computer instructions for:

redistributing one or more originator data subsets among a plurality of originator nodes; and

determining data redistribution information pertaining to redistribution of the one or more originator data subsets among the plurality of originator nodes; and

sending data redistribution information to a replica system;

wherein

the data redistribution information is used by the replica system to redistribute one or more corresponding replica data subsets among a plurality of replica nodes.

18. A system comprising:

an interface configured to receive data redistribution information from an originator system, the data redistribution information pertaining to redistribution of the one or more originator data subsets among a plurality of originator nodes; and

one or more processors configured to redistribute one or more corresponding replica data subsets among a plurality of replica nodes according to the data redistribution information.

19. A method for data replication, comprising:

receiving data redistribution information from an originator system, the data redistribution information pertaining to redistribution of the one or more originator data subsets among a plurality of originator nodes; and

redistributing one or more corresponding replica data subsets among a plurality of replica nodes according to the data redistribution information.

20. A computer program product for data replication, the computer program product being embodied in a computer readable storage medium and comprising computer instructions for:

receiving data redistribution information from an originator system, the data redistribution information pertaining to redistribution of the one or more originator data subsets among a plurality of originator nodes; and

redistributing one or more corresponding replica data subsets among a plurality of replica nodes according to the data redistribution information.