Method, electronic device and computer program product for storage management

Patent metadata

Field	Value
Publication number	US-2021286680-A1
Application number	US-202017018058-A
Country	US
Kind code	A1
Filing date	Sep 11, 2020
Priority date	Mar 13, 2020
Publication date	Sep 16, 2021
Grant date	—

Abstract

Techniques involve: acquiring a first source snapshot for a source storage object stored in a source storage device; determining first difference data between the first source snapshot and the source storage object or a second source snapshot for the source storage object, creation time of the first source snapshot being associated with creation time of the second source snapshot; and sending the first difference data to a destination storage device to enable the destination storage device to create a first destination snapshot for a destination storage object stored in the destination storage device based on the first difference data. Such techniques can migrate snapshots more efficiently to improve storage management efficiency.

First claim

1 . A storage management method, comprising:
acquiring a first source snapshot for a source storage object stored in a source storage device; determining first difference data between the first source snapshot and the source storage object or a second source snapshot for the source storage object, creation time of the first source snapshot being associated with creation time of the second source snapshot; and sending the first difference data to a destination storage device to enable the destination storage device to create a first destination snapshot for a destination storage object stored in the destination storage device based on the first difference data.

2 . The method according to claim 1 , wherein the step of acquiring the first source snapshot comprises:
determining whether the first source snapshot is to be copied into the destination storage device; and acquiring the first source snapshot in response to determining that the first source snapshot is to be copied into the destination storage device.

3 . The method according to claim 1 , wherein the step of determining the first difference data comprises:
determining whether the creation time of the first source snapshot is later than a predetermined time point; and determining the first difference data between the first source snapshot and the source storage object in response to determining that the creation time of the first source snapshot is later than the predetermined time point.

4 . The method according to claim 3 , further comprising:
acquiring the second source snapshot in response to determining that the creation time of the first source snapshot is earlier than the predetermined time point, the creation time of the second source snapshot being later than the creation time of the first source snapshot; and determining the first difference data between the first source snapshot and the second source snapshot.

5 . The method according to claim 1 , wherein the first difference data is determined based on the first source snapshot and the source storage object, and the method further comprises:
sending an identifier of the source storage object to the destination storage device to instruct the destination storage device to create the first destination snapshot based on the first difference data and the destination storage object corresponding to the identifier of the source storage object.

6 . The method according to claim 1 , wherein the first difference data is determined based on the first source snapshot and the second source snapshot, and the method further comprises:
sending an identifier of the second source snapshot to the destination storage device to instruct the destination storage device to create the first destination snapshot based on the first difference data and a second destination snapshot corresponding to the identifier of the second source snapshot.

7 . The method according to claim 1 , wherein the snapshot for the source storage object is stored in a dendritic structure, and the method further comprises:
based on the dendritic structure, determining whether a sub source snapshot stored in association with the first source snapshot exists; determining second difference data between the first source snapshot and the sub source snapshot in response to determining that the sub source snapshot exists; and sending the second difference data to the destination storage device to enable the destination storage device to create a sub destination snapshot for the destination storage object based on the second difference data.

8 . An electronic device, comprising:
at least one processing unit; at least one memory, the at least one memory being coupled to the at least one processing unit and storing a set of instructions utilized to be executed by the at least one processing unit, wherein the set of instructions, when executed by the at least one processing unit, causes the device to perform actions, and the actions comprise:
acquiring a first source snapshot for a source storage object stored in a source storage device;
determining first difference data between the first source snapshot and the source storage object or a second source snapshot for the source storage object, creation time of the first source snapshot being associated with creation time of the second source snapshot; and
sending the first difference data to a destination storage device to enable the destination storage device to create a first destination snapshot for a destination storage object stored in the destination storage device based on the first difference data.

9 . The device according to claim 8 , wherein the action of acquiring the first source snapshot comprises:
determining whether the first source snapshot is to be copied into the destination storage device; and acquiring the first source snapshot in response to determining that the first source snapshot is to be copied into the destination storage device.

10 . The device according to claim 8 , wherein the action of determining the first difference data comprises:
determining whether the creation time of the first source snapshot is later than a predetermined time point; and determining the first difference data between the first source snapshot and the source storage object in response to determining that the creation time of the first source snapshot is later than the predetermined time point.

11 . The device according to claim 10 , wherein the actions further comprise:
acquiring the second source snapshot in response to determining that the creation time of the first source snapshot is earlier than the predetermined time point, the creation time of the second source snapshot being later than the creation time of the first source snapshot; and determining the first difference data between the first source snapshot and the second source snapshot.

12 . The device according to claim 8 , wherein the first difference data is determined based on the first source snapshot and the source storage object, and the method further comprises:
sending an identifier of the source storage object to the destination storage device to instruct the destination storage device to create the first destination snapshot based on the first difference data and the destination storage object corresponding to the identifier of the source storage object.

13 . The device according to claim 8 , wherein the first difference data is determined based on the first source snapshot and the second source snapshot, and the method further comprises:
sending an identifier of the second source snapshot to the destination storage device to instruct the destination storage device to create the first destination snapshot based on the first difference data and a second destination snapshot corresponding to the identifier of the second source snapshot.

14 . The device according to claim 8 , wherein the snapshot for the source storage object is stored in a dendritic structure, and the method further comprises:
based on the dendritic structure, determining whether a sub source snapshot stored in association with the first source snapshot exists; determining second difference data between the first source snapshot and the sub source snapshot in response to determining that the sub source snapshot exists; and sending the second difference data to the destination storage device to enable the destination storage device to create a sub destination snapshot for the destination storage object based on the second difference data.

15 . A computer program product having a non-transitory computer readable medium whi

Assignees

• Emc Ip Holding Co Llc

Inventors

• Kang Jian
• Li Chenglin
• Zhang Ruiyang
• Luo Mingyi
• Zeng Hongyuan

Classifications

• G06F3/0655

  Vertical data movement, i.e. input-output transfer; data movement between one or more hosts and one or more storage devices · CPC title

• G06F3/0604

  Improving or facilitating administration, e.g. storage management · CPC title

• G06F11/1446 Primary

  Point-in-time backing up or restoration of persistent data · CPC title

• G06F3/0647

  Migration mechanisms · CPC title

• G06F2201/84

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