Storage utilizing a distributed cache chain and a checkpoint drive in response to a data drive corruption

Patent metadata

Field	Value
Publication number	US-2020004639-A1
Application number	US-201916565816-A
Country	US
Kind code	A1
Filing date	Sep 10, 2019
Priority date	Sep 25, 2015
Publication date	Jan 2, 2020
Grant date	—

Abstract

A storage method and device for a solid-state drive is provided in embodiments of the present disclosure. The method includes: configuring a checkpoint drive and a cache drive; backing up data blocks from a data drive into the checkpoint drive; and in response to the data drives being corrupted, writing into a further data drive part of the data blocks backed up into the checkpoint drive and part of data blocks in the cache drive. The number of required SSD drives can be significantly reduced with the method and device without losing the data restoration capability. In addition, the degrading performance can also be maintained at a relatively high level.

First claim

What is claimed is:

1 . A storage method for a solid-state disk, comprising:
configuring a checkpoint drive and a cache drive, wherein the cache drive comprises a plurality of solid-state disks, wherein the cache drive includes a cache chain distributed in each solid-state disk drive of the plurality of solid-state disk drives; backing up data blocks from a data drive into the checkpoint drive; and in response to the data drive being corrupted, writing into a further data drive part of the data blocks backed up into the checkpoint drive and part of the data blocks in the cache drive.

2 . The method of claim 1 , wherein the checkpoint drive comprises a hard disk drive, and the data drive comprises a solid-state disk.

3 . The method of claim 1 , wherein the cache drive is part of the data drive.

4 . The method of claim 1 , further comprising:
before backing up the data blocks from the data drive into the checkpoint drive: assigning a version number to the data drive for each write operation into the data drive and the cache drive; and writing the data blocks into the data drive and the cache drive.

5 . The method of claim 4 , wherein backing up the data blocks from the data drive into the checkpoint drive comprises:
sequentially backing up the data blocks from the data drive into the checkpoint drive; and recording a latest version number as a check point number.

6 . The method of claim 5 , wherein sequentially backing up the data blocks from the data drive into the checkpoint drive comprises: after backing up the data blocks from the data drive into the check point drive, identifying data blocks with a version number smaller than the checkpoint number as backed-up data blocks.

7 . The method of claim 5 , wherein in response to the data drive being corrupted, writing into the further data drive part of the data blocks backed up in the checkpoint drive and part of the data blocks in the cache drives comprises:
writing data blocks with a version number equal to the checkpoint number from the checkpoint drive into the further data drive; and writing data blocks with a version number larger than the checkpoint number from the cache drive into the further data drive.

8 . A storage device for a solid-state disk, comprising:
a check point drive; a cache drive, wherein the cache drive comprises a plurality of solid-state disks, wherein the cache drive includes a cache chain distributed in each solid-state disk drive of the plurality of solid-state disk drives; a backup unit configured to back up data blocks from a data drive into the checkpoint drive; and a writing-back unit configured to, in response to the data drives being corrupted, write into a further data drive part of the data blocks backed up into the checkpoint drive and part of the data blocks in the cache drive.

9 . The device of claim 8 , wherein the checkpoint drive comprises a hard disk drive, and the data drive comprises a solid-state disk.

10 . The device of claim 8 , wherein the cache drive is part of the data drive.

11 . The device of claim 8 , further comprising:
a version number assigning unit configured to assign a version number to the data drive for each write operation into the data drive and the cache drive; and a writing unit configured to write the data block into the data drive and the cache drive.

12 . The device of claim 11 , wherein the backup unit is configured to:
sequentially back up the data blocks from the data drive into the checkpoint drive; and record a latest version number as a check point number.

13 . The device of claim 12 , wherein the backup unit is configured to: after backing up the data blocks from the data drive into the checkpoint drive, identify data blocks with a version number smaller than the check point number as backed-up data blocks.

14 . The device of claim 12 , wherein the writing-back unit is configured to, in response to the data drive being corrupted:
write data blocks with a version number equal to the checkpoint number from the check point drive into the further data drive; and write data blocks with a version number larger than the checkpoint number from the cache drive into the further data drive.

15 . A computer program product for storage of a solid-state drive, the computer program product comprising:
a non-transitory computer readable medium encoded with computer-executable code, wherein the code is configured to enable the execution of: configuring a checkpoint drive and a cache drive, wherein the cache drive comprises a plurality of solid-state disks, wherein the cache drive includes a cache chain distributed in each solid-state disk drive of the plurality of solid-state disk drives; backing up data blocks from a data drive into the checkpoint drive; and in response to the data drive being corrupted, writing into a further data drive part of the data blocks backed up into the checkpoint drive and part of the data blocks in the cache drive.

16 . The computer program product of claim 15 , wherein the checkpoint drive comprises a hard disk drive, and the data drive comprises a solid-state disk.

17 . The computer program product of claim 15 , wherein the cache drive is part of the data drive.

18 . The computer program product of claim 15 , wherein the code is further configured to enable the execution of: before backing up the data blocks from the data drive into the checkpoint drive:
assigning a version number to the data drive for each write operation into the data drive and the cache drive; and writing the data blocks into the data drive and the cache drive.

19 . The computer program product of claim 18 , wherein backing up the data blocks from the data drive into the checkpoint drive comprises:
sequentially backing up the data blocks from the data drive into the checkpoint drive; and recording a latest version number as a check point number.

20 . The computer program product of claim 19 , wherein sequentially backing up the data blocks from the data drive into the checkpoint drive comprises: after backing up the data blocks from the data drive into the check point drive, identifying data blocks with a version number smaller than the checkpoint number as backed-up data blocks.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Xiao Huibing
• Gao Jian
• Gao Hongpo
• Han Geng
• Dong Jibing
• Li Liam Xiongcheng

Classifications

• G06F11/1456

  Hardware arrangements for backup · CPC title

• G06F2201/805

  Real-time · CPC title

• G06F2201/84

  Using snapshots, i.e. a logical point-in-time copy of the data · CPC title

• G06F11/1448

  Management of the data involved in backup or backup restore · CPC title

• G06F11/2094

  Redundant storage or storage space (G06F11/2056 takes precedence) · CPC title