Incremental backing up method and system based on data block

Abstract

The invention discloses an incremental backing up method and system based on a data block and relates to the field of data block backing up. The method comprises the steps that whether the content of the data block to be backed up already changes or not is judged by verifying a digital fingerprint of the data block to be backed up; if the content of the data block changes, incremental backing up is performed; if the content of the data block does not change, backing up is not performed. Compared with the technology of performing incremental backing up by judging the update time of data in the prior art, repeated backing up of the data of which the time is updated and the content does not change is avoided; in this way, the backed up data size is reduced greatly, the backing up efficiency of stored data is improved, it is guaranteed that small pressure is brought to a storage system in the process of backing up the data block under the condition that the storage system keeps a working state, the consumed time of backing up is shortened, and the disaster recovery risk of backing up is also lowered.

Description

technical field [0001] The invention relates to the field of data block backup, in particular to a method and system for incremental backup based on data blocks. Background technique [0002] Data block backup is the basis of data block disaster recovery. It refers to the process of copying all or part of the data block collection from the hard disk or array of the application host to other storage media in order to prevent the loss of data blocks caused by system operation errors or system failures. . [0003] Data block backup includes full backup, differential backup, and incremental backup. With the massive increase of data blocks, in order to reduce the amount of data blocks backed up, reduce backup time, reduce the pressure on storage during backup, and reduce the number of backup interruptions Generally, incremental backup is adopted. The so-called incremental backup refers to the last backup (no matter what kind of backup): after the last backup, all files that have...

AI Technical Summary

Problems solved by technology

[0004] But, the incremental backup of prior art, owing to judge whether the file changes according to the update time of the file, and then determine whether to carry out the backup, so, there is following shortcoming: when the operator only modifies a small amount of content, then the time of the file is obtained It has been updated and changed, but most of the content of the file has not been updated and has not changed. Therefore, backing up the time-updated files will lead to repeated backups of a large number of files with the same content, so that the file with a large amount of data blocks In this case, the time-consuming backup will be further increased, and the backup will bring huge additional pressure to the storage, as well as the number of times the backup is interrupted, and the number of times the backup needs to be re-backed up after the interruption

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