ZERO COPY VOLUME RECONSTRUCTION

• US 20150350315A1
• Filed: 05/29/2014
• Published: 12/03/2015
• Est. Priority Date: 05/29/2014
• Status: Active Grant

• Current Assignee: NetApp, Inc.
• Original Assignee: NetApp, Inc.
• Inventors: Eisler, Michael, Shekhar, Sisir, George, Tijin
• Granted Patent: US 9,485,308 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 3/0605 by facilitating the interaction with a user or administrator
• CPC Class Codes: G06F 3/0614 Improving the reliability of storage systems
• CPC Class Codes: G06F 3/0617 in relation to availability
• CPC Class Codes: H04L 67/1095 Replication or mirroring of data, e.g. scheduling or transport for data synchronisation between network nodes
• CPC Class Codes: H04L 67/1097 for distributed storage of data in networks, e.g. transport arrangements for network file system [NFS], storage area networks [SAN] or network attached storage [NAS]

Abstract

Examples described herein include a data migration system for migrating data between different data storage environments. The data migration system creates a first volume on a first storage system, and creates a logical unit within the first volume. The data migration system then creates a virtual volume on a virtual storage system associated with a second storage system, wherein data stored in the virtual volume is backed by the logical unit on the first storage system. The data migration system then replicates, on the virtual volume, a set of data stored on the second storage system. Upon replicating the set of data onto the virtual volume the virtual storage system may automatically create a copy of the corresponding data in the logical unit of the first volume.

Claims

1. A method of data migration, the method comprising:

creating a first volume on a first storage system;

creating a logical unit within the first volume;

creating a virtual volume on a virtual storage system associated with a second storage system, wherein data stored on the virtual volume is backed by the logical unit on the first storage system; and

replicating, on the virtual volume, a set of data stored on the second storage system.

2. The method of claim 1, wherein the set of data is stored in a tree-based quota (qtree).

3. The method of claim 2, wherein replicating the set of data comprises:

replicating the set of data onto the virtual volume using a qtree replication function of the virtual storage system.

4. The method of claim 3, wherein the first storage system is a Cluster-Mode (C-Mode) system and the second storage system is a 7-Mode system, and wherein the qtree replication function corresponds to a 7-to-7 qtree snapmirror.

5. The method of claim 1, wherein upon replicating the set of data onto the virtual volume the virtual storage system automatically creates a copy of the corresponding data in the logical unit of the first storage system.

6. The method of claim 1, further comprising:

creating a second volume on the first storage system; and

copying a set of references associated with the set of data from the virtual volume to the second volume.

7. The method of claim 6, wherein copying the set of references comprises:

copying the set of references to the second volume using a volume replication function of the virtual storage system.

8. The method of claim 7, wherein the first storage system is a C-Mode system and the second storage system is a 7-Mode system, and wherein the volume replication function corresponds to a 7-to-C volume snapmirror.

9. The method of claim 6, wherein each reference in the set of references points to a respective block of data in the first volume where at least a portion of the set of data is stored.

10. The method of claim 6, further comprising:

copying the set of data from the logical unit to the second volume; and

deleting the first volume.

11. A data migration system comprising:

a memory containing machine readable medium comprising machine executable code having stored thereon;

a processing module, coupled to the memory, to execute the machine executable code to;

create a first volume on a first storage system;

create a logical unit within the first volume;

create a virtual volume on a virtual storage system associated with a second storage system, wherein data stored on the virtual volume is backed by the logical unit on the first storage system; and

replicate, on the virtual volume, a set of data stored on the second storage system.

12. The data migration system of claim 11, wherein the set of data is stored in a tree-based quota (qtree).

13. The data migration system of claim 12, wherein the processing module is to replicate the set of data by:

replicating the set of data on the virtual volume using a qtree replication function of the virtual storage system.

14. The data migration system of claim 13, wherein the first storage system is a Cluster-Mode (C-Mode) system and the second storage system is a 7-Mode system, and wherein the qtree replication function corresponds to a 7-to-7 qtree snapmirror.

15. The data migration system of claim 11, wherein upon replicating the set of data onto the virtual volume the virtual storage system automatically creates a copy of the corresponding data in the logical unit of the first storage system.

16. The data migration system of claim 11, wherein the processing module is to further:

create a second volume on the first storage system; and

copy a set of references associated with the set of data from the virtual volume to the second volume.

17. The data migration system of claim 16, wherein the processing module is to copy the set of references by:

copying the set of references to the second volume using a volume replication function of the virtual storage system.

18. The data migration system of claim 16, wherein each reference in the set of references points to a respective block of data in the first volume where at least a portion of the set of data is stored.

19. The data migration system of claim 16, wherein the processing module is to further:

copy the set of data from the logical unit to the second volume; and

delete the first volume.

20. A computer-readable medium for implementing data migration between storage systems, the computer-readable medium storing instructions that, when executed by one or more processors, cause the one or more processors to perform operations comprising:

creating a first volume on a first storage system;

creating a logical unit within the first volume;

creating a virtual volume on a virtual storage system associated with a second storage system, wherein data stored on the virtual volume is backed by the logical unit on the first storage system; and

replicating, on the virtual volume, a set of data stored on the second storage system.