Snapshot method and device of storage system, electronic equipment and readable storage medium

Abstract

The invention discloses a snapshot method and device of a storage system, electronic equipment and a readable storage medium. The method comprises the steps that when it is detected that a copy-on-write snapshot is created, a corresponding bitmap is automatically allocated to a source volume; the bits of the bitmap are in one-to-one correspondence with the data blocks of the source volume; when a data write-in request is received, whether copy-on-write needs to be carried out or not is judged according to the flag bit of the bitmap and the data backup failure record information; if copy-on-write needs to be carried out, firstly data in the source volume is copied to the snapshot volume, the bitmap is updated, and then to-be-written data corresponding to the data writing request is written into the source volume; and if the copy-on-write does not need to be carried out, the data to be written is directly written into the source volume. According to the method and the device, data backup can be realized in a copy-on-write snapshot mode on the basis of not influencing the host service.

Description

technical field [0001] The present application relates to the field of computer technology, in particular to a storage system snapshot method, device, electronic equipment and readable storage medium. Background technique [0002] In the information age, data is related to the survival of an enterprise, and data security has become increasingly important. Different scenarios require different disaster recovery and backup technologies. Commonly used data protection technologies in storage systems include local backup and remote backup. When efficient and fast backup is required, local backup technology can usually be chosen; and when regional disasters need to be dealt with, remote backup technology is usually chosen for data backup. [0003] Snapshot is a commonly used local backup technology. It can back up data at any point in time. When data rollback is required, snapshot data can also be used for rollback. In order to reduce the impact of snapshots on business, in busi...

AI Technical Summary

Problems solved by technology

However, if the snapshot is abnormal during the data backup process, the old data cannot be backed up to the snapshot volume, and new data cannot be written to the data volume, thereby affecting the host business

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