METHOD OF ENHANCING THE PERFORMANCE OF STORAGE SYSTEM THROUGH OPTIMIZATION IN COMPRESSED VOLUME MIGRATION

• US 20180275896A1
• Filed: 03/21/2017
• Published: 09/27/2018
• Est. Priority Date: 03/21/2017
• Status: Active Grant

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Mehrotra, Sumit, Patel, Kushal S., Patel, Sarvesh S.
• Granted Patent: US 10,481,806 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 11/1662 the resynchronized component or unit being a persistent storage device re-synchronization of failed mirror storage G06F11/2082; rebuild or reconstruction of parity RAID storage G06F11/1008
• CPC Class Codes: G06F 11/20 using active fault-masking, e.g. by switching out faulty elements or by switching in spare elements
• CPC Class Codes: G06F 3/0617 in relation to availability
• CPC Class Codes: G06F 3/0619 in relation to data integrity, e.g. data losses, bit errors
• CPC Class Codes: G06F 3/0647 Migration mechanisms
• CPC Class Codes: G06F 3/0665 at area level, e.g. provisioning of virtual or logical volumes
• CPC Class Codes: G06F 3/0689 Disk arrays, e.g. RAID, JBOD

Abstract

A data migration management apparatus includes a data migration module, a decompression module, and a consolidation module. The data migration module determines a plurality of compressed extents on a source controller are subject to a data migration process to a target controller. The decompression module receives an input/output request at a storage virtualization controller, from a host application, after the data migration process has begun. A response to the input/output request includes decompressing one of the plurality of compressed extents on the source controller not yet migrated. The consolidation module executes the response to the input/output request and writes to the target controller from a single decompressed extent.

Claims

1. A method for managing data migration, comprising:

determining a plurality of compressed extents on a source controller are subject to a data migration process to a target controller;

receiving an input/output request at a storage virtualization controller during the data migration process, from a host application, after the data migration process has begun, wherein a response to the input/output request comprises decompressing one of the plurality of compressed extents on the source controller not yet migrated by the data migration process;

deviating from a predetermined sequence of migration of the plurality of compressed extents on the source controller in response to receiving the input/output request;

decompressing the one of the plurality of compressed extents at the storage virtualization controller in response to the input/output request, after the data migration process has begun, to produce a decompressed extent of the one of the plurality of compressed extents which is subject to the data migration and not yet migrated; and

executing the response to the input/output request and writing to the target controller from the decompressed extent after executing the response to the input/output request.

2. The method of claim 1, wherein the input/output request comprises a read request, and wherein the executing the response to the input/output request comprises providing a read response to the host application.

3. The method of claim 2, wherein the compressed extents are decompressed by the storage virtualization controller during the data migration process.

4. The method of claim 1, wherein the input/output request comprises a write request, and wherein the executing the response to the input/output request comprises providing a write response to the target storage.

5. The method of claim 1, further comprising determining from a bitmap manager that the one of the plurality of compressed extents on the source controller, subject to the input/output request, has not yet migrated.

6. The method of claim 1, further comprising determining a predetermined sequence of migration of the plurality of compressed extents on the source controller.

7. The method of claim 6, further comprising:

resuming the predetermined sequence of migration of the plurality of compressed extents.

8. The method of claim 6, further comprising:

skipping the one of the plurality of compressed extents upon resuming the predetermined sequence of migration.

9. A data migration management apparatus, comprising:

a data migration module that determines a plurality of compressed extents on a source controller are subject to a data migration process to a target controller;

a decompression module that receives an input/output request at a storage virtualization controller during the data migration process, from a host application, after the data migration process has begun, wherein a response to the input/output request comprises decompressing one of the plurality of compressed extents on the source controller not yet migrated by the data migration process, wherein the data migration module deviates from a predetermined sequence of migration of the plurality of compressed extents on the source controller in response to the decompression module receiving the input/output request; and

a consolidation module that executes the response to the input/output request and writes to the target controller from a single decompressed extent after executing the response to the input/output request.

10. The apparatus of claim 9, wherein the input/output request comprises a read request, and wherein executes the response to the input/output request comprises provide a read response to the host application.

11. The apparatus of claim 10, wherein the compressed extents are decompressed by the storage virtualization controller during the data migration process.

12. The apparatus of claim 9, wherein the input/output request comprises a write request, and wherein executes the response to the input/output request comprises provide a write response to the target storage.

13. The apparatus of claim 9, wherein the data migration module determines a predetermined sequence of migration of the plurality of compressed extents on the source controller.

14. The apparatus of claim 13, wherein the data migration module resumes the predetermined sequence of migration of the plurality of compressed extents.

15. The apparatus of claim 14, wherein the data migration module skips the one of the plurality of compressed extents upon resuming the predetermined sequence of migration.

16. A computer program product for providing data migration management, the computer program product comprising a computer readable storage medium having program instructions embodied therewith, the program instructions readable/executable by a processor to cause the processor to:

determine a plurality of compressed extents on a source controller are subject to a data migration process to a target controller;

receive an input/output request at a storage virtualization controller during the data migration process, from a host application, after the data migration process has begun, wherein a response to the input/output request comprises decompressing one of the plurality of compressed extents on the source controller not yet migrated by the data migration process;

deviate from a predetermined sequence of migration of the plurality of compressed extents on the source controller in response to receiving the input/output request;

decompress the one of the plurality of compressed extents at the storage virtualization controller in response to the input/output request, after the data migration process has begun, to produce a decompressed extent of the one of the plurality of compressed extents which is subject to the data migration and not yet migrated; and

execute the response to the input/output request and write to the target controller from the decompressed extent after executing the response to the input/output request.

17. The computer program product of claim 16, the program instructions readable/executable by the processor to further cause the processor to determine from a bitmap manager that the one of the plurality of compressed extents on the source controller, subject to the input/output request, has not yet migrated.

18. The computer program product of claim 16, the program instructions readable/executable by the processor to further cause the processor to determine a predetermined sequence of migration of the plurality of compressed extents on the source controller.

19. The computer program product of claim 18, the program instructions readable/executable by the processor to further cause the processor to resume the predetermined sequence of migration of the plurality of compressed extents.

20. The computer program product of claim 19, the program instructions readable/executable by the processor to further cause the processor to skip the one of the plurality of compressed extents upon resuming the predetermined sequence of migration.