Managing data inconsistencies in storage systems

Patent metadata

Field	Value
Publication number	US-9367395-B1
Application number	US-201414502177-A
Country	US
Kind code	B1
Filing date	Sep 30, 2014
Priority date	Mar 31, 2014
Publication date	Jun 14, 2016
Grant date	Jun 14, 2016

Abstract

A method is used in managing data inconsistencies in storage systems. A data inconsistency is detected in a portion of a file system. The portion of the file system includes a set of file system data blocks. The portion of the file system is recovered. The portion of the file system is validated by using information stored in a set of mapping pointers associated with the set of file system data blocks.

First claim

What is claimed is:

1. A method for use in managing data inconsistencies in storage systems, the method comprising:
detecting a data inconsistency in a portion of a file system, wherein the portion of the file system includes a set of file system data blocks;
recovering the portion of the file system; and
validating the portion of the file system by using information stored in a set of mapping pointers associated with the set of file system data blocks, wherein a file system mapping logic works in conjunction with a multi-core RAID logic for detecting the data inconsistency in the portion of the file system.

2. The method of claim 1 , wherein validating the portion of the file system further comprising:
comparing a newly computed checksum for each file system data block of the set of file system data blocks and a checksum value included in a mapping pointer for each file system data block.

3. The method of claim 1 , wherein a file system is associated with a set of sparse volumes, wherein each sparse volume includes a set of slices, each slice of the set of slices is a logical representation of a subset of physical disk storage.

4. The method of claim 1 , wherein the file system resides on a storage system, wherein the storage system includes a disk drive system comprising a plurality of Redundant Array of Inexpensive Disks (RAID) systems, each RAID system of the plurality of RAID systems having a first disk drive and a second disk drive.

5. The method of claim 1 , further comprising:
updating a state of the file system to an offline state for recovering the file system upon determining that the validation of the portion of the file system has failed.

6. The method of claim 1 , wherein the file system is represented by a file system hierarchy, the file system hierarchy including a set of indirect data blocks, each indirect data block including a set of data blocks.

7. The method of claim 1 , wherein each file system data block of the set of file system data blocks is associated with a mapping pointer, wherein a mapping pointer includes a checksum value for a file system data block.

8. The method of claim 1 , wherein an indirect data block includes a set of mapping pointers, wherein each mapping pointer points to a file system data block.

9. A method for use in managing data inconsistencies in storage systems, the method comprising:
detecting a data inconsistency in a portion of a file system, wherein the portion of the file system includes a set of file system data blocks;
recovering the portion of the file system; and
validating the portion of the file system by using information stored in a set of mapping pointers associated with the set of file system data blocks, wherein the portion of the file system is recovered by rebuilding the portion of the file system by a multi-core RAID logic.

10. The method of claim 9 , wherein each file system data block of the set of file system data blocks is associated with a mapping pointer, wherein a mapping pointer includes a checksum value for a file system data block.

11. A system for use in managing data inconsistencies in storage systems, the system comprising a processor configured to:
detect a data inconsistency in a portion of a file system, wherein the portion of the file system includes a set of file system data blocks;
recover the portion of the file system; and
validate the portion of the file system by using information stored in a set of mapping pointers associated with the set of file system data blocks, wherein a file system mapping logic works in conjunction with a multi-core RAID logic for detecting the data inconsistency in the portion of the file system.

12. The system of claim 11 , wherein validating the portion of the file system further comprising:
comparing a newly computed checksum for each file system data block of the set of file system data blocks and a checksum value included in a mapping pointer for each file system data block.

13. The system of claim 11 , wherein a file system is associated with a set of sparse volumes, wherein each sparse volume includes a set of slices, each slice of the set of slices is a logical representation of a subset of physical disk storage.

14. The system of claim 11 , wherein the file system resides on a storage system, wherein the storage system includes a disk drive system comprising a plurality of Redundant Array of Inexpensive Disks (RAID) systems, each RAID system of the plurality of RAID systems having a first disk drive and a second disk drive.

15. The system of claim 11 , further comprising:
update a state of the file system to an offline state for recovering the file system upon determining that the validation of the portion of the file system has failed.

16. The system of claim 11 , wherein the file system is represented by a file system hierarchy, the file system hierarchy including a set of indirect data blocks, each indirect data block including a set of data blocks.

17. The system of claim 11 , wherein each file system data block of the set of file system data blocks is associated with a mapping pointer, wherein a mapping pointer includes a checksum value for a file system data block.

18. The system of claim 11 , wherein an indirect data block includes a set of mapping pointers, wherein each mapping pointer points to a file system data block.

19. A system for use in managing data inconsistencies in storage systems, the system comprising a processor configured to:
detect a data inconsistency in a portion of a file system, wherein the portion of the file system includes a set of file system data blocks;
recover the portion of the file system; and
validate the portion of the file system by using information stored in a set of mapping pointers associated with the set of file system data blocks, wherein the portion of the file system is recovered by rebuilding the portion of the file system by a multi-core RAID logic.

20. The system of claim 19 , wherein each file system data block of the set of file system data blocks is associated with a mapping pointer, wherein a mapping pointer includes a checksum value for a file system data block.

Assignees

• Emc Corp

Inventors

• Bono Jean-Pierre
• Armangau Philippe

Classifications

• G06F11/1435 Primary

  using file system or storage system metadata · CPC title

• G06F2201/82

  Solving problems relating to consistency · CPC title

• G06F16/174 Primary

  Redundancy elimination performed by the file system (error detection or correction of the data by redundancy in operations G06F11/14) · CPC title

• G06F11/1092 Primary

  Rebuilding, e.g. when physically replacing a failing disk · CPC title

• G06F17/3015

  Physics · mapped topic