Snapshot creating and reading method and device and storage medium

A snapshot, to-be-read technology, applied in the fields of instrumentation, error detection/correction, calculation, etc., can solve the problems of long-time snapshot creation, slow speed, and large amount of snapshot data, so as to reduce the creation time and improve the creation speed. Effect

Inactive Publication Date: 2021-10-01
ALIBABA GRP HLDG LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, the amount of data in the full snapshot is large, and the creation of the snapshot takes a long time and is slow

Method used

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  • Snapshot creating and reading method and device and storage medium
  • Snapshot creating and reading method and device and storage medium
  • Snapshot creating and reading method and device and storage medium

Examples

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Embodiment Construction

[0023] In order to make the purpose, technical solution and advantages of the present application clearer, the technical solution of the present application will be clearly and completely described below in conjunction with specific embodiments of the present application and corresponding drawings. Apparently, the described embodiments are only some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0024] In view of the problem in the prior art that creating a full snapshot takes a long time and is slow, in the embodiment of this application, during the snapshot creation process, if the incremental snapshot to be created needs to rely on the data blocks in the historical snapshot, then in In the metadata of the incremental snapshot to be created...

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Abstract

The embodiment of the invention provides a snapshot creating and reading method and device and a storage medium. In the snapshot creation process provided by the embodiment of the invention, if an incremental snapshot to be created needs to depend on a data block in a historical snapshot, in metadata of the incremental snapshot to be created, not only is a position index of the data block in the historical snapshot depended by the incremental snapshot to be created recorded, but also a data key used by the historical snapshot needs to be recorded; the key is used for decrypting the data blocks in the historical snapshots on which the incremental snapshots to be created depend, so that the incremental snapshots can still be created after the key rotation without creating full snapshots, the time consumption for creating the snapshots can be reduced, and the creation speed can be increased.

Description

technical field [0001] The present application relates to the technical field of data storage, and in particular to a snapshot creating and reading method, device and storage medium. Background technique [0002] Disk snapshots are mainly used for backup and disaster recovery. Users can create several snapshots of a disk at different time points to form a snapshot chain. The existing snapshot creation generally adopts the incremental snapshot technology, that is, the data blocks in the old snapshot can be referenced in the new snapshot. [0003] In an encrypted storage scenario, in order to improve data security, the key needs to be rotated. Before and after the key rotation, the keys used in the old and new snapshots are inconsistent. However, key rotation requires that after the disk key is replaced, the data blocks in the entire new snapshot must be fully decrypted with the new key. [0004] Therefore, in the existing technology, the first snapshot after key rotation n...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/14G06F21/60
CPCG06F11/1448G06F21/602
Inventor 廖武钧
Owner ALIBABA GRP HLDG LTD
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