Method and device for storage management with metadata stored in disk extents in an extent pool

Patent metadata

Field	Value
Publication number	US-10788997-B2
Application number	US-201816021651-A
Country	US
Kind code	B2
Filing date	Jun 28, 2018
Priority date	Jun 30, 2017
Publication date	Sep 29, 2020
Grant date	Sep 29, 2020

Abstract

A method and device for storage management comprising: in response to receiving a request for creating an extent pool, creating the extent pool at least on a user disk, the extent pool comprising a plurality of disk extents; storing data in at least one disk extent of the plurality of disk extents; and storing address information for locating the at least one disk extent in a system disk communicably connected to the user disk. Through the technical solution of the present disclosure, the user can store metadata associated with RAID in the user disk and load metadata associated with RAID from the user disk so as to reduce the access and load of the system disk.

First claim

We claim:

1. A method of storage management, comprising:
in response to receiving a request for creating an extent pool, creating the extent pool at least on a user disk, the extent pool comprising a plurality of disk extents;
storing data in at least one disk extent of the plurality of disk extents in the extent pool on the user disk, at least in part by creating a redundant array of independent disks (RAID) on the extent pool and storing metadata associated with the RAID in the at least one disk extent, wherein storing the data in the at least one disk extent of the plurality of disk extents in the extent pool on the user disk includes storing the data in three disk extents on different drives in the plurality of disk extents in the extent pool on the user disk and providing triple-mirror-level protection for the metadata stored on the three disk extents on different drives in the plurality of disk extents in the extent pool on the user disk; and
storing address information for locating the at least one disk extent in a system disk communicably connected to the user disk.

2. The method according to claim 1 , further comprising:
storing, in the at least one disk extent, identity information of the extent pool or size information of the plurality of disk extents in the extent pool on the user disk.

3. The method according to claim 1 , further comprising:
loading the address information for locating the at least one disk extent from the system disk; and
loading the data from the at least one disk extent based on the address information.

4. The method according to claim 3 , wherein loading the data from the at least one disk extent based on the address information comprises:
loading metadata associated with a redundant array of independent disks (RAID) from the at least one disk extent, the RAID being created on the extent pool.

5. The method according to claim 4 , further comprising:
loading the extent pool and the RAID based on the metadata in the at least one disk extent.

6. The method of claim 1 , wherein storing the metadata associated with the RAID in the at least one disk extent of the plurality of disk extents in the extent pool on the user disk reduces reading and writing of the system disk.

7. An electronic device, comprising:
at least one processing unit; and
at least one memory coupled to the at least one processing unit and storing machine executable instructions, the instructions, when executed by the at least one processing unit, causing the electronic device to perform acts, comprising:
in response to receiving a request for creating an extent pool, creating the extent pool at least on a user disk, the extent pool comprising a plurality of disk extents;
storing data in at least one disk extent of the plurality of disk extents in the extent pool on the user disk, at least in part by creating a redundant array of independent disks (RAID) on the extent pool and storing metadata associated with the RAID in the at least one disk extent, wherein storing the data in the at least one disk extent of the plurality of disk extents in the extent pool on the user disk includes storing the data in three disk extents on different drives in the plurality of disk extents in the extent pool on the user disk and providing triple-mirror-level protection for the metadata stored on the three disk extents on different drives in the plurality of disk extents in the extent pool on the user disk; and
storing address information for locating the at least one disk extent in a system disk communicably connected to the user disk.

8. The device according to claim 7 , the acts further comprising:
storing, in the at least one disk extent, identity information of the extent pool or size information of the plurality of disk extents in the extent pool on the user disk.

9. The device according to claim 7 , the acts further comprising:
loading the address information for locating the at least one disk extent from the system disk; and
loading the data from the at least one disk extent based on the address information.

10. The device according to claim 9 , wherein loading the data from the at least one disk extent based on the address information comprises:
loading metadata associated with a redundant array of independent disks (RAID) from the at least one disk extent, the RAID being created on the extent pool.

11. The device according to claim 10 , the acts further comprising:
loading the extent pool and the RAID based on the metadata in the at least one disk extent.

12. A computer program product for storage management, the computer program product comprising:
a non-transitory computer readable medium encoded with computer-executable code, the code configured for the execution of:
in response to receiving a request for creating an extent pool, creating the extent pool at least on a user disk, the extent pool comprising a plurality of disk extents;
storing data in at least one disk extent of the plurality of disk extents in the extent pool on the user disk, at least in part by creating a redundant array of independent disks (RAID) on the extent pool and storing metadata associated with the RAID in the at least one disk extent, wherein storing the data in the at least one disk extent of the plurality of disk extents in the extent pool on the user disk includes storing the data in three disk extents on different drives in the plurality of disk extents in the extent pool on the user disk and providing triple-mirror-level protection for the metadata stored on the three disk extents on different drives in the plurality of disk extents in the extent pool on the user disk; and
storing address information for locating the at least one disk extent in a system disk communicably connected to the user disk.

13. The computer program product of claim 12 , the code further configured for the execution of:
storing, in the at least one disk extent, identity information of the extent pool or size information of the plurality of disk extents in the extent pool on the user disk.

14. The computer program product of claim 12 , the code further configured for the execution of:
loading the address information for locating the at least one disk extent from the system disk; and
loading the data from the at least one disk extent based on the address information.

15. The computer program product of claim 14 , wherein loading the data from the at least one disk extent based on the address information comprises:
loading metadata associated with a redundant array of independent disks (RAID) from the at least one disk extent, the RAID being created on the extent pool.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Gong Shaoqin
• Gao Hongpo
• Gao Jian
• Kang Jamin Jianbin
• Sun Ree Lei

Classifications

• G06F3/061 Primary

  Improving I/O performance · CPC title

• G06F3/0631 Primary

  by allocating resources to storage systems · CPC title

• G06F3/0689

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

• G06F3/0644

  Management of space entities, e.g. partitions, extents, pools · CPC title

• G06F3/0619

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