Cloud snapshots

• US 9,563,517 B1
• Filed: 12/30/2013
• Issued: 02/07/2017
• Est. Priority Date: 12/30/2013
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Inventors: Weiss, Eran, Natanzon, Assaf
• Primary Examiner(s): Shaw, Peling
• Application Number:
  US14/143,778
• Time in Patent Office: 1,135 Days
• US Class Current: 1/1
• CPC Class Codes: G06F 11/1451 by selection of backup contents
• CPC Class Codes: G06F 11/1464 for networked environments
• CPC Class Codes: G06F 11/1471 involving logging of persistent data for recovery
• CPC Class Codes: G06F 2201/84 Using snapshots, i.e. a logical point-in-time copy of the data
• 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

A computer implemented method, system, and program product for creating snapshots instructions at a replication site, the method comprising determining the differences between a first snapshot at a first time of a LUN and a second snapshot at a second time of the LUN, determining the differences between the second snapshot and a third snapshot at a third time of the LUN, creating a redacted snapshot of the second snapshot wherein the redacted snapshot contains pointers to the first snapshot for the common data in the first snapshot and the second snapshot; wherein the redacted snapshot contains pointers to the third snapshot for common data in the second snapshot and the third snapshot; and further wherein the redacted snapshot stored data that is not present in the first snapshot and is not present in the third snapshot.

Claims

1. A system for data replication, the system comprising:

a production site including a LUN; and

computer-executable logic operating in memory, wherein the computer-executable program logic is configured for execution of;

determining the differences between a first snapshot at a first time of the LUN and a second snapshot at a second time of the LUN;

determining the differences between the second snapshot and a third snapshot at a third time of the LUN;

creating a redacted snapshot of the second snapshot wherein the redacted snapshot contains pointers to the first snapshot for the common data in the first snapshot and the second snapshot;

wherein the redacted snapshot contains pointers to the third snapshot for common data in the second snapshot and the third snapshot; and

further wherein the redacted snapshot stores data that is not present in the first snapshot and is not present in the third snapshot.

2. The system of claim 1 wherein the computer-executable program logic is further configured for execution of:

sending the first snapshot and the second snapshot to cloud based storage.

3. The system of claim 2 wherein the computer-executable program logic is further configured for execution of:

sending the third snapshot to the cloud based storage; and

replacing the second snapshot in the cloud based storage with the redacted snapshot.

4. The system of claim 2 wherein sending each of the first, second, third, and redacted snapshots to the cloud based storage includes:

dividing the respective snapshot into a plurality of chunks;

compressing the chunks; and

encrypting the compressed chunks.

5. The system of claim 4 wherein the computer-executable program logic is further configured for execution of sending an object containing metadata corresponding to a hash of each chunk of the unencrypted chunk to the cloud storage.

6. The system of claim 4 wherein the computer-executable program logic is further configured for execution of sending an object containing metadata corresponding to a file structure of the chunks corresponding to the replicated LUN snapshot.

7. A computer program product comprising:

a non-transitory computer readable medium encoded with computer executable program, the code enabling;

determining the differences between a first snapshot at a first time of a LUN and a second snapshot at a second time of the LUN;

determining the differences between the second snapshot and a third snapshot at a third time of the LUN;

creating a redacted snapshot of the second snapshot wherein the redacted snapshot contains pointers to the first snapshot for the common data in the first snapshot and the second snapshot;

wherein the redacted snapshot contains pointers to the third snapshot for common data in the second snapshot and the third snapshot; and

further wherein the redacted snapshot stored data that is not present in the first snapshot and is not present in the third snapshot.

8. The computer program product of claim 7 wherein the code further enables:

sending the first snapshot and the second snapshot to cloud based storage.

9. The computer program product of claim 8 wherein the computer-executable program logic is further configured for execution of:

sending the third snapshot to the cloud based storage; and

replacing the second snapshot in the cloud based storage with the redacted snapshot.

10. The computer program product of claim 8 wherein sending each of the first, second, third, and redacted snapshots to the cloud based storage includes:

dividing the respective snapshot into a plurality of chunks;

compressing the chunks; and

encrypting the compressed chunks.

11. The computer program product of claim 10 wherein the code further enables execution of sending an object containing metadata corresponding to a hash of each chunk of the unencrypted chunk to the cloud storage.

12. The computer program product of claim 10 wherein the code further enables execution of sending an object containing metadata corresponding to the file structure of the chunks corresponding to the replicated LUN snapshot.

13. A computer implemented method for creating snapshots instructions at a replication site, the method comprising:

determining the differences between a first snapshot at a first time of a LUN and a second snapshot at a second time of the LUN;

determining the differences between the second snapshot and a third snapshot at a third time of the LUN;

creating a redacted snapshot of the second snapshot wherein the redacted snapshot contains pointers to the first snapshot for the common data in the first snapshot and the second snapshot;

wherein the redacted snapshot contains pointers to the third snapshot for common data in the second snapshot and the third snapshot; and

further wherein the redacted snapshot stored data that is not present in the first snapshot and is not present in the third snapshot.

14. The method of claim 13 further comprising:

sending the first snapshot and the second snapshot to cloud based storage.

15. The method of claim 14 further comprising:

sending the third snapshot to the cloud based storage; and

replacing the second snapshot in the cloud based storage with the redacted snapshot.

16. The method of claim 14 wherein sending each of the first, second, third, and redacted snapshots to the cloud based storage includes:

dividing the respective snapshot into a plurality of chunks;

compressing the chunks; and

encrypting the compressed chunks.

17. The method of claim 16 further comprising sending an object containing metadata corresponding to a hash of each chunk of the unencrypted chunk to the cloud storage.

18. The method of claim 17 further comprising sending an object containing metadata corresponding to the file structure of the chunks corresponding to the replicated LUN snapshot.