Storage device group split technique for extent pool with hybrid capacity storage devices system and method

Patent metadata

Field	Value
Publication number	US-10540103-B1
Application number	US-201715664730-A
Country	US
Kind code	B1
Filing date	Jul 31, 2017
Priority date	Jul 31, 2017
Publication date	Jan 21, 2020
Grant date	Jan 21, 2020

Abstract

A method, computer program product, and computer system for initializing, on a computing device, an N*N Weighted Neighborhood Matrix according to an existing Mapped RAID layout. N disks in an original disk partner group (DPG) may be partitioned into a target DPG, where N is a number of disks in an extent pool, wherein the N disks have at least two different capacities. The target DPG may be marked for at least a portion of the N disks. The target DPG may be marked for E RAID extents, where E is a number of RAID extents in the original DPG. At least a portion of disk extents for the E RAID extents in the original DPG may be moved to the target DPG.

First claim

What is claimed is:

1. A computer-implemented method comprising:
initializing, on a computing device, an N*N Weighted Neighborhood Matrix according to an existing Mapped RAID layout;
partitioning N disks in an original disk partner group (DPG) into a target DPG, where N is a number of disks in an extent pool, wherein the N disks have at least two different capacities;
marking the target DPG for at least a portion of the N disks;
marking the target DPG for E RAID extents, where E is a number of RAID extents in the original DPG; and
moving at least a portion of disk extents for the E RAID extents in the original DPG to the target DPG, wherein moving the at least a portion of disk extents for the E RAID extents includes moving each disk extent associated with a respective RAID extent such that the respective RAID extent spans a single DPG.

2. The computer-implemented method of claim 1 wherein moving at least the portion of disk extents for the E RAID extents in the original DPG to the target DPG includes selecting a target RAID extent, for each of at least the portion of disk extents, resulting in a balance of free disk extent counts in the original DPG and the target DPG.

3. The computer-implemented method of claim 2 wherein moving at least the portion of disk extents for the E RAID extents in the original DPG to the target DPG includes virtually removing from the original DPG any disk extents for the E RAID extents belonging to the target DPG.

4. The computer-implemented method of claim 3 further comprising updating the N*N Weighted Neighborhood Matrix based upon, at least in part, the virtual removal.

5. The computer-implemented method of claim 3 further comprising locating a new disk extent in the target DPG for each disk extent virtually removed.

6. The computer-implemented method of claim 5 wherein locating the new disk extent in the target DPG for each disk extent virtually removed includes locating a valid and optimal disk extent in the target DPG that results in a lowest variance of sub-matrix values for the target DPG.

7. The computer-implemented method of claim 6 further comprising allocating the new disk extent in the target DPG for each disk extent virtually removed.

8. A computer program product residing on a non-transitory computer readable storage medium having a plurality of instructions stored thereon which, when executed across one or more processors, causes at least a portion of the one or more processors to perform operations comprising:
initializing an N*N Weighted Neighborhood Matrix according to an existing Mapped RAID layout;
partitioning N disks in an original disk partner group (DPG) into a target DPG, where N is a number of disks in an extent pool, wherein the N disks have at least two different capacities;
marking the target DPG for at least a portion of the N disks;
marking the target DPG for E RAID extents, where E is a number of RAID extents in the original DPG; and
moving at least a portion of disk extents for the E RAID extents in the original DPG to the target DPG, wherein moving the at least a portion of disk extents for the E RAID extents includes moving each disk extent associated with a respective RAID extent such that the respective RAID extent spans a single DPG.

9. The computer program product of claim 8 wherein moving at least the portion of disk extents for the E RAID extents in the original DPG to the target DPG includes selecting a target RAID extent, for each of at least the portion of disk extents, resulting in a balance of free disk extent counts in the original DPG and the target DPG.

10. The computer program product of claim 9 wherein moving at least the portion of disk extents for the E RAID extents in the original DPG to the target DPG includes virtually removing from the original DPG any disk extents for the E RAID extents belonging to the target DPG.

11. The computer program product of claim 10 wherein the operations further comprise updating the N*N Weighted Neighborhood Matrix based upon, at least in part, the virtual removal.

12. The computer program product of claim 10 wherein the operations further comprise locating a new disk extent in the target DPG for each disk extent virtually removed.

13. The computer program product of claim 12 wherein locating the new disk extent in the target DPG for each disk extent virtually removed includes locating a valid and optimal disk extent in the target DPG that results in a lowest variance of sub-matrix values for the target DPG.

14. The computer program product of claim 13 wherein the operations further comprise allocating the new disk extent in the target DPG for each disk extent virtually removed.

15. A computing system including one or more processors and one or more memories configured to perform operations comprising:
initializing an N*N Weighted Neighborhood Matrix according to an existing Mapped RAID layout;
partitioning N disks in an original disk partner group (DPG) into a target DPG, where N is a number of disks in an extent pool, wherein the N disks have at least two different capacities;
marking the target DPG for at least a portion of the N disks;
marking the target DPG for E RAID extents, where E is a number of RAID extents in the original DPG; and
moving at least a portion of disk extents for the E RAID extents in the original DPG to the target DPG, wherein moving the at least a portion of disk extents for the E RAID extents includes moving each disk extent associated with a respective RAID extent such that the respective RAID extent spans a single DPG.

16. The computing system of claim 15 wherein moving at least the portion of disk extents for the E RAID extents in the original DPG to the target DPG includes selecting a target RAID extent, for each of at least the portion of disk extents, resulting in a balance of free disk extent counts in the original DPG and the target DPG.

17. The computing system of claim 16 wherein moving at least the portion of disk extents for the E RAID extents in the original DPG to the target DPG includes virtually removing from the original DPG any disk extents for the E RAID extents belonging to the target DPG.

18. The computing system of claim 17 wherein the operations further comprise updating the N*N Weighted Neighborhood Matrix based upon, at least in part, the virtual removal.

19. The computing system of claim 17 wherein the operations further comprise locating a new disk extent in the target DPG for each disk extent virtually removed.

20. The computing system of claim 19 wherein locating the new disk extent in the target DPG for each disk extent virtually removed includes locating a valid and optimal disk extent in the target DPG that results in a lowest variance of sub-matrix values for the target DPG.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Gao Jian
• Han Geng
• Usvyatsky Ilya
• Kang Jamin
• Gao Hongpo
• Dong Jibing

Classifications

• G06F3/0619 Primary

  in relation to data integrity, e.g. data losses, bit errors · CPC title

• G06F3/0689

  Disk arrays, e.g. RAID, JBOD · CPC title

• G06F3/067

  Distributed or networked storage systems, e.g. storage area networks [SAN], network attached storage [NAS] · CPC title

• G06F3/0631

  by allocating resources to storage systems · CPC title

• G06F3/0665

  at area level, e.g. provisioning of virtual or logical volumes · CPC title