Method, device, and computer program product for rebuilding data

• US 11,099,954 B2
• Filed: 10/17/2019
• Issued: 08/24/2021
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Inventors: Gao, Wei, Sun, Ao, Teng, Yu, Wu, Jialei, Cheng, Chunxi
• Primary Examiner(s): Ko, Chae M
• Application Number:
  US16/655,382
• Publication Number:
  US 20200133811A1
• Time in Patent Office: 677 Days
• Field of Search: 714 63, 714 632
• CPC Class Codes: G06F 11/2094 Redundant storage or storage space G06F11/2056 takes precedence
• CPC Class Codes: G06F 2201/82 Solving problems relating to consistency ensuring consistency in mirrored systems G06F11/2064

Abstract

Techniques provide for rebuilding data. Such techniques involve: obtaining health status information related to a first disk of a storage system, the first disk being divided into a plurality of disk units, and the health status information indicating a failure of a first disk unit of the plurality of disk units; determining a data block stored in the first disk unit based on a mapping between data blocks for the storage system and storage locations; and rebuilding the data block into a second disk of the storage system when maintaining accessibility of other data blocks in other disk units of the first disk than the first disk unit. Accordingly, it is possible to improve the data rebuilding efficiency when a disk fails partly and to continue utilizing the storage space portion in the disk that is not failed, without making the disk be offline temporarily.

Claims

1. A method of rebuilding data, comprising:

obtaining health status information related to a first disk of a storage system, wherein the first disk comprises a solid state disk having multiple channels, the first disk being divided into a plurality of disk units, wherein each one of the plurality of disk units corresponds to a different one of the multiple channels of the solid state disk, and the health status information indicating a failure of a first disk unit of the plurality of disk units;

determining a data block stored in the first disk unit based on a mapping between data blocks for the storage system and storage locations; and

rebuilding the data block into a second disk of the storage system, while maintaining accessibility of other data blocks in other disk units of the first disk than the first disk unit.

2. The method of claim 1, further comprising:

marking the first disk unit as inaccessible so as to prevent the first disk unit from being reallocated for storing data.

3. The method of claim 1, wherein the storage system comprises a distribution storage system.

4. The method of claim 3, wherein the first and second disks are located at different physical nodes of the distribution storage system.

5. The method of claim 1, wherein a copy of the data block is stored in a third disk of the plurality of disks, the first and third disks being distributed at different physical nodes, and wherein rebuilding the data block into the second disk comprises:

rebuilding the data block into the second disk with the copy.

6. The method of claim 1, wherein the data block and a plurality of further data blocks are comprised in a data chunk, the plurality of further data blocks being stored in further disks different from the first disk in the storage system, and wherein rebuilding the data block into the second disk comprising:

rebuilding the data block into the second disk with the plurality of further data blocks.

7. The method of claim 1, wherein obtaining the health status information comprises:

receiving the health status information from disk firmware associated with the first disk.

8. The method of claim 1, wherein the availability of the other data blocks of other disk units of the first disk is maintained simultaneously with the rebuilding of the data block into the second disk of the storage system without making the first disk offline.

9. The method of claim 1, wherein the health status information further indicates that the disk units of the first disk other than the first disk unit are healthy.

16. The device of claim 7, wherein obtaining the health status information comprises:

receiving the health status information from disk firmware associated with the first disk.

10. An electronic device, comprising:

a processor; and

a memory coupled to the processor and having instructions stored therein, the instructions, when executed by the processor, causing the device to perform acts including;

obtaining health status information related to a first disk of a storage system, wherein the first disk comprises a solid state disk having multiple channels, the first disk being divided into a plurality of disk units, wherein each one of the plurality of disk units corresponds to a different one of the multiple channels of the solid state disk, and the health status information indicating a failure of a first disk unit of the plurality of disk units;

determining a data block stored in the first disk unit based on a mapping between data blocks for the storage system and storage locations; and

rebuilding the data block into a second disk of the storage system, while maintaining accessibility of other data blocks in other disk units of the first disk than the first disk unit.

11. The device of claim 10, wherein the acts further comprise:

marking the first disk unit as inaccessible so as to prevent the first disk unit from being reallocated for storing data.

12. The device of claim 10, wherein the storage system comprises a distribution storage system.

13. The device of claim 12, wherein the first and second disks are located at different physical nodes of the distribution storage system.

14. The device of claim 10, wherein a copy of the data block is stored in a third disk of the plurality of disks, the first and third disks being distributed at different physical nodes, and wherein rebuilding the data block into the second disk includes:

rebuilding the data block into the second disk with the copy.

15. The device of claim 10, wherein the data block and a plurality of further data blocks are comprised in a data chunk, the plurality of further data blocks being stored in further disks different from the first disk in the storage system, and wherein rebuilding the data block into the second disk includes:

rebuilding the data block into the second disk using the plurality of further data blocks.

17. A computer program product having a non-transitory computer readable medium which stores a set of instructions that, when carried out by a computerized device, causes the computerized device to:

obtain health status information related to a first disk of a storage system, wherein the first disk comprises a solid state disk having multiple channels, the first disk being divided into a plurality of disk units, wherein each one of the plurality of disk units corresponds to a different one of the multiple channels of the solid state disk, and the health status information indicating a failure of a first disk unit of the plurality of disk units;

determine a data block stored in the first disk unit based on a mapping between data blocks for the storage system and storage locations; and

rebuild the data block into a second disk of the storage system, while maintaining accessibility of other data blocks in other disk units of the first disk than the first disk unit.

18. The computer program product of claim 17, wherein the computer executable instructions, when executed, further cause the device to:

mark the first disk unit as inaccessible so as to prevent the first disk unit from being reallocated for storing data.

19. The computer program product of claim 17, wherein the storage system includes a distribution storage system.

20. The computer program product of claim 19, wherein the first and second disks are located at different physical nodes of the distribution storage system.

21. The computer program product of claim 17, wherein a copy of the data block is stored in a third disk of the plurality of disks, the first and third disks being distributed at different physical nodes, and wherein the computer executable instructions, when executed, further cause the device to:

rebuild the data block into the second disk with the copy.

22. The computer program product of claim 17, wherein the data block and a plurality of further data blocks are comprised in a data chunk, the plurality of further data blocks being stored in further disks different from the first disk in the storage system, and wherein the computer executable instructions, when executed, further cause the device to:

rebuild the data block into the second disk with the plurality of further data blocks.

23. The computer program product of claim 17, wherein the computer executable instructions, when executed, further cause the device to:

receive the health status information from disk firmware associated with the first disk.