Method, device and computer program product for validating cache file

Patent metadata

Field	Value
Publication number	US-10776271-B2
Application number	US-201916284596-A
Country	US
Kind code	B2
Filing date	Feb 25, 2019
Priority date	Oct 26, 2018
Publication date	Sep 15, 2020
Grant date	Sep 15, 2020

Abstract

Embodiments of the present disclosure provide a method, device and computer program product for validating a cache file. In an embodiment, a reference cache file associated with the backed up data is divided into a plurality of reference segments. Reference check information is generated for the respective reference segments of the plurality of reference segments, and the generated reference check information is stored. In response to the initiating of a backup job, the stored reference check information is used to validate the cache file.

First claim

We claim:

1. A method of validating a cache file, comprising:
segmenting a reference cache file associated with backed up data into a plurality of reference segments;
generating reference check information for each of the plurality of reference segments;
storing the reference check information; and
in response to initiating a backup job for data, validating the cache file by using the reference check information, wherein the data is associated with the backed up data, wherein validating the cache file comprises:
determining a segmentation mode of the plurality of reference segments and a generation mode of the reference check information;
dividing the cache file into a plurality of segments in the segmentation mode;
generating, for a segment of the plurality of segments, check information of the segment based on the generation mode of the reference check information; and
validating the segment of the cache file by comparing the check information and the reference check information.

2. The method according to claim 1 , wherein the reference cache file comprises a file header and a plurality of elements, and segmenting the reference cache file into the plurality of reference segments comprises:
determining the file header as one of the plurality of reference segments; and
dividing the plurality of elements into remaining reference segments of the plurality of reference segments.

3. The method according to claim 2 , wherein dividing the plurality of elements into the remaining reference segments of the plurality of reference segments comprises:
determining a reference number of elements to be included in each reference segment of the remaining reference segments; and
dividing the plurality of elements into the remaining reference segments based on the reference number of elements.

4. The method according to claim 1 , wherein storing the reference check information comprises:
storing the reference check information in a check file.

5. The method according to claim 1 , wherein validating the segment of the cache file further comprises:
in response to the check information being different from the reference check information, identifying the segment as an invalid segment.

6. A device for validating a cache file, comprising:
a processor, and
a memory comprising computer executable instructions stored thereon, the computer executable instructions, when executed by the processor, causing the device to perform a method, the method comprising:
segmenting a reference cache file associated with backed up data into a plurality of reference segments;
generating reference check information for each of the plurality of reference segments;
storing the reference check information; and
in response to initiating a backup job for data, validating the cache file by using the reference check information, wherein the data is associated with the backed up data, wherein validating the cache file comprises:
determining a segmentation mode of the plurality of reference segments and a generation mode of the reference check information;
dividing the cache file into a plurality of segments in the segmentation mode;
generating, for a segment of the plurality of segments, check information of the segment based on the generation mode of the reference check information; and
validating the segment of the cache file by comparing the check information and the reference check information.

7. The device according to claim 6 , wherein the reference cache file comprises a file header and a plurality of elements, and segmenting the reference cache file into the plurality of reference segments comprises:
determining the file header as one of the plurality of reference segments; and
dividing the plurality of elements into remaining reference segments of the plurality of reference segments.

8. The device according to claim 7 , wherein dividing the plurality of elements into the remaining reference segments of the plurality of reference segments comprises:
determining a reference number of elements to be included in each reference segment of the remaining reference segments; and
dividing the plurality of elements into the remaining reference segments based on the reference number of elements.

9. The device according to claim 6 , wherein storing the reference check information comprises:
storing the reference check information in a check file.

10. The device according to claim 6 , wherein validating the segment of the cache file further comprises:
in response to the check information being different from the reference check information, identifying the segment as an invalid segment.

11. A computer program product tangibly stored on a non-transient computer readable medium and comprising machine executable instructions which, when executed, cause a machine to perform a method for validating a cache file, the method comprising:
segmenting a reference cache file associated with backed up data into a plurality of reference segments;
generating reference check information for each of the plurality of reference segments;
storing the reference check information; and
in response to initiating a backup job for data, validating the cache file by using the reference check information, wherein the data is associated with the backed up data, wherein validating the cache file comprises:
determining a segmentation mode of the plurality of reference segments and a generation mode of the reference check information;
dividing the cache file into a plurality of segments in the segmentation mode;
generating, for a segment of the plurality of segments, check information of the segment based on the generation mode of the reference check information; and

validating the segment of the cache file by comparing the check information and the reference check information.

12. The computer program product according to claim 11 , wherein the reference cache file comprises a file header and a plurality of elements, and segmenting the reference cache file into the plurality of reference segments comprises:
determining the file header as one of the plurality of reference segments; and
dividing the plurality of elements into remaining reference segments of the plurality of reference segments.

13. The computer program product according to claim 12 , wherein dividing the plurality of elements into the remaining reference segments of the plurality of reference segments comprises:
determining a reference number of elements to be included in each reference segment of the remaining reference segments; and
dividing the plurality of elements into the remaining reference segments based on the reference number of elements.

14. The computer program product according to claim 11 , wherein storing the reference check information comprises:
storing the reference check information in a check file.

15. The computer program product according to claim 11 , wherein validating the segment of the cache file further comprises:
in response to the check information being different from the reference check information, identifying the segment as an invalid segment.

Assignees

• Emc Ip Holding Co Llc

Inventors

• Chen Wei
• Wang Yi
• Zheng Qingxiao

Classifications

• G06F11/1464

  for networked environments · CPC title

• G06F11/1448 Primary

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

• G06F12/0871

  Allocation or management of cache space · CPC title

• G06F2212/1032

  Reliability improvement, data loss prevention, degraded operation etc · CPC title

• G06F12/0815 Primary

  Cache consistency protocols · CPC title