METHODS FOR REPLICATING DATA AND ENABLING INSTANTANEOUS ACCESS TO DATA AND DEVICES THEREOF

• US 20160117374A1
• Filed: 10/24/2014
• Published: 04/28/2016
• Est. Priority Date: 10/24/2014
• Status: Active Grant

• Current Assignee: NetApp, Inc.
• Original Assignee: NetApp, Inc.
• Inventors: Curley, Jonathan, Simharajan, Srishylam, Shah, Devang, Jernigan, Richard
• Granted Patent: US 9,773,004 B2
• Time in Patent Office: Days
• US Class Current: 1/1
• CPC Class Codes: G06F 16/119 Details of migration of file systems migration mechanisms in storage systems G06F3/0647
• CPC Class Codes: G06F 16/122 using management policies backup systems G06F11/1446; file migration policies for HSM systems G06F16/185
• CPC Class Codes: G06F 16/1844 Management specifically adapted to replicated file systems
• CPC Class Codes: G06F 3/0647 Migration mechanisms

Abstract

A method, non-transitory computer readable medium, and device that replicates data and provides instantaneous access to data includes receiving in a destination volume one or more named data extents and one or more references to the one or more named data extents associated with a file in parallel from a source volume. A determination is made to check whether the one or more references arrive before the one or more named data extents arrive. Each of the received one or more references which are determined to have arrived prior to the one or more data extents is allocated as absent by the storage management computing device. An instantaneous access to the file is provided during the allocation.

Claims

1. A method for replicating data and providing instantaneous access to data, the method comprising:

receiving in a destination volume, by storage management computing device, one or more named data extents and one or more references to the one or more named data extents associated with a file in parallel from a source volume;

determining, by the storage management computing device, when the received one or more references to the one or more named data extents arrive before the one or more named data extents;

allocating, by the storage management computing device, each of the received one or more references which are determined to have arrived prior to the one or more data extents as absent; and

providing, by the storage management computing device, an instantaneous access to the file during the allocation.

2. The method as set forth in claim 1 wherein the determining further comprises creating, by the storage management computing device, a data extent mapping between the received one or more named data extents and corresponding one or more locally stored data extents in the destination volume when at least one of the received one or more references is determined to have arrived after the corresponding one or more named data extents.

3. The method as set forth in claim 2 further comprising resolving, by the storage management computing device, the one or more received data extents based on the created data extent mapping.

4. The method as set forth in claim 3 further comprising adding, by the storage management computing device, the received one or more data extents at one or more referenced locations within the file stored in the destination volume.

5. The method as set forth in claim 1 wherein the allocating further comprises, adding, by the storage management computing device, one or more missing data extents when the one or more named data extents arrives after the allocation.

6. The method as set forth in claim 5 wherein the adding further comprises, adding, by the storage management computing device, the one or more named data extents to the file based on information from the source volume.

7. A non-transitory computer readable medium having stored thereon instructions for replicating data and providing instantaneous access to data comprising executable code which when executed by a processor, causes the processor to perform steps comprising:

receiving one or more named data extents and one or more references to the one or more named data extents associated with a file in parallel from a source volume;

determining when the received one or more references to the one or more named data extents arrive before the one or more named data extents;

allocating each of the received one or more references which are determined to have arrived prior to the one or more data extents as absent; and

providing an instantaneous access to the file during the allocation.

8. The medium as set forth in claim 7 wherein the determining further comprises creating a data extent mapping between the received one or more named data extents and corresponding one or more locally stored data extents in the destination volume when at least one of the received one or more references is determined to have arrived after the corresponding one or more named data extents.

9. The medium as set forth in claim 8 further comprising resolving the one or more received data extents based on the created data extent mapping.

10. The medium as set forth in claim 9 further comprising adding the received one or more data extents at one or more referenced locations within the file stored in the destination volume.

11. The medium as set forth in claim 7 wherein the allocating further comprises, adding one or more missing data extents when the one or more named data extents arrives after the allocation.

12. The medium as set forth in claim 11 wherein the adding further comprises, adding the one or more named data extents to the file based on information from the source volume.

13. A storage management computing device comprising:

a processor;

a memory, wherein the memory coupled to the processor which are configured to execute programmed instructions stored in the memory comprising;

receiving one or more named data extents and one or more references to the one or more named data extents associated with a file in parallel from a source volume;

determining when the received one or more references to the one or more named data extents arrive before the one or more named data extents;

allocating each of the received one or more references which are determined to have arrived prior to the one or more data extents as absent; and

providing an instantaneous access to the file during the allocation.

14. The device as set forth in claim 13 wherein the processor is further configured to execute programmed instructions stored in the memory for the determining further comprises creating a data extent mapping between the received one or more named data extents and corresponding one or more locally stored data extents in the destination volume when at least one of the received one or more references is determined to have arrived after the corresponding one or more named data extents.

15. The device as set forth in claim 14 wherein the processor is further configured to execute programmed instructions stored in the memory further comprising resolving the one or more received data extents based on the created data extent mapping.

16. The device as set forth in claim 15 wherein the processor is further configured to execute programmed instructions stored in the memory further comprising adding the received one or more data extents at one or more referenced locations within the file stored in the destination volume.

17. The device as set forth in claim 13 wherein the processor is further configured to execute programmed instructions stored in the memory for the allocating further comprises, adding one or more missing data extents when the one or more named data extents arrives after the allocation.

18. The device as set forth in claim 17 wherein the processor is further configured to execute programmed instructions stored in the memory for the adding further comprises, adding the one or more named data extents to the file based on information from the source volume.