METHOD, DEVICE, AND COMPUTER PROGRAM PRODUCT FOR DELETING SNAPSHOTS

• US 20200133920A1
• Filed: 10/18/2019
• Published: 04/30/2020
• Est. Priority Date: 10/31/2018
• Status: Active Grant

• Current Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Original Assignee: Emc IP Holding Company LLC (Dell Technologies Inc.)
• Inventors: Wang, Fei, Jiang, Changxu
• Granted Patent: US 11,294,856 B2
• Time in Patent Office: Days
• CPC Class Codes: G06F 16/128 Details of file system snapshots on the file-level, e.g. snapshot creation, administration, deletion use of snapshots for error detection or correction G06F11/14, G06F11/16

Abstract

Techniques perform snapshot deletion. Such techniques involve: determining an object associated with a to-be-executed snapshot deletion request in a snapshot deletion request list of a storage system; in response to the object being included in a predefined set of objects, determining information associated with the to-be-executed snapshot deletion request, the information including at least one of: a number of snapshot deletion requests in the snapshot deletion request list which correspond to snapshots associated with the object, and a waiting time of the to-be-executed snapshot deletion request in the snapshot deletion request list; determining, based on the information and from the snapshot deletion request list, a set of snapshot deletion requests associated with the object; and deleting snapshots corresponding to snapshot deletion requests in the set. Accordingly, the performance of snapshot deletion operations may be improved without any impact on other service on the storage system.

Claims

1. A method for deleting a snapshot, comprising:

determining an object associated with a to-be-executed snapshot deletion request in a snapshot deletion request list of a storage system;

in response to the object being included in a predefined set of objects, determining information associated with the to-be-executed snapshot deletion request, the information comprising at least one of;

a number of snapshot deletion requests in the snapshot deletion request list which correspond to snapshots associated with the object, and a waiting time of the to-be-executed snapshot deletion request in the snapshot deletion request list;

determining, based on the information and from the snapshot deletion request list, a set of snapshot deletion requests associated with the object; and

deleting snapshots corresponding to snapshot deletion requests in the set.

2. The method according to claim 1, wherein determining the set comprises:

in response to the number included in the information exceeding a threshold number, determining, from the snapshot deletion request list, snapshot deletion requests associated with the object, as snapshot deletion requests in the set.

3. The method according to claim 1, further comprising:

in response to the number included in the information not exceeding the threshold number, moving a position of the to-be-executed snapshot deletion request in the snapshot deletion request list backward.

4. The method according to claim 3, further comprising:

in response to reduction of remaining storage space in the storage system for storing snapshots, reducing the threshold number.

5. The method according to claim 1, wherein determining the set comprises:

in response to the waiting time included in the information exceeding a threshold time, determining, from the snapshot deletion request list, snapshot deletion requests associated with the object, as snapshot deletion requests in the set.

6. The method according to claim 1, further comprising:

in response to the waiting time included in the information not exceeding the threshold time, moving a position of the to-be-executed snapshot deletion request in the snapshot deletion request list backward.

7. The method according to claim 6, further comprising:

in response to reduction of remaining storage space for storing snapshots in the storage system, reducing the threshold time.

8. The method according to claim 1, wherein the object comprises at least one of:

a logical unit device, a file system, and a data repository.

9. A device for snapshot deletion, comprising:

at least one processing unit;

at least one memory coupled to the at least one processing unit and storing instructions to be executed by the at least one processing unit, the instructions, when being executed by the at least one processing unit, causing the device to perform acts comprising;

determining an object associated with a to-be-executed snapshot deletion request in a snapshot deletion request list of a storage system;

in response to the object being included in a predefined set of objects, determining information associated with the to-be-executed snapshot deletion request, the information comprising at least one of;

a number of snapshot deletion requests in the snapshot deletion request list which correspond to snapshots associated with the object, and a waiting time of the to-be-executed snapshot deletion request in the snapshot deletion request list;

determining, based on the information and from the snapshot deletion request list, a set of snapshot deletion requests associated with the object; and

deleting snapshots corresponding to snapshot deletion requests in the set.

10. The device according to claim 9, wherein determining the set comprises:

in response to the number included in the information exceeding a threshold number, determining, from the snapshot deletion request list, snapshot deletion requests associated with the object, as snapshot deletion requests in the set.

11. The device according to claim 9, wherein the acts further comprise:

in response to the number included in the information not exceeding the threshold number, moving a position of the to-be-executed snapshot deletion request in the snapshot deletion request list backward.

12. The device according to claim 11, wherein the acts further comprise:

in response to reduction of remaining storage space in the storage system for storing snapshots, reducing the threshold number.

13. The device according to claim 9, wherein determining the set comprises:

in response to the waiting time included in the information exceeding a threshold time, determining, from the snapshot deletion request list, snapshot deletion requests associated with the object, as snapshot deletion requests in the set.

14. The device according to claim 9, wherein the acts further comprise:

in response to the waiting time included in the information not exceeding the threshold time, moving a position of the to-be-executed snapshot deletion request in the snapshot deletion request list backward.

15. The device according to claim 14, wherein the acts further comprise:

in response to reduction of remaining storage space for storing snapshots in the storage system, reducing the threshold time.

16. The device according to claim 9, wherein the object comprises at least one of:

a logical unit device, a file system, and a data repository.

17. A computer program product having a non-transitory computer readable medium which stores a set of instructions to delete a snapshot;

the set of instructions, when carried out by computerized circuitry, causing the computerized circuitry to perform a method of;

determining an object associated with a to-be-executed snapshot deletion request in a snapshot deletion request list of a storage system;

in response to the object being included in a predefined set of objects, determining information associated with the to-be-executed snapshot deletion request, the information comprising at least one of;

a number of snapshot deletion requests in the snapshot deletion request list which correspond to snapshots associated with the object, and a waiting time of the to-be-executed snapshot deletion request in the snapshot deletion request list;

determining, based on the information and from the snapshot deletion request list, a set of snapshot deletion requests associated with the object; and

deleting snapshots corresponding to snapshot deletion requests in the set.