Logical volume rapid synchronization method based on data differentia

Abstract

The invention relates to a rapid synchronization method of logical volumes based on data difference, which belongs to the technical field of computer data storage. The method comprises steps of finding out used data blocks on each logical volumes according to file system information of source volumes and destination volumes, comparing corresponding data block pairs on the source logical volumes and the destination logical volumes, then computing two eigenvalues of a data block pair, synchronizing the data block pair if the two eigenvalues are varied, or not synchronizing if not. The invention only compares the used data blocks in case of data synchronization, thereby obviously reducing the range of data comparison, and simultaneously only the changed data blocks are synchronized during synchronization, thereby effectively reducing the quantity of synchronized data.

Description

technical field [0001] The invention belongs to the technical field of computer data storage, and mainly solves the problem of quickly synchronizing the data of the source volume and the target volume when the data of the source volume and the target volume are inconsistent in a continuous data protection system to make the data consistent again. Background technique [0002] Nowadays, computers are becoming more and more important to individuals, enterprises and governments, especially important data stored in computers. Once these data are lost or destroyed, the loss will be difficult to estimate. Existing data protection technologies, such as RAID , remote mirroring, volume shadow copy service, snapshot, etc., can be divided into physical block level, logical volume level, file level or application level from the implementation level. Among them, data protection at the logical volume level has the advantages of being independent of upper-layer applications and specific ph...

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Problems solved by technology

[0007] The purpose of the present invention is to solve the problem that when the data of the source volume and the destination volume are inconsistent or the data of the source volume is damaged after the system has been running for a period of time, the problem of performing fast data synchronization to make the data of the source volume and the destination volume reach a consistent state again; Based on the method of rapid synchronization of logical volume data based on data differences, the present invention only compares the used data blocks during data synchronization, which obviously reduces the scope of data comparison, and at the same time only synchronizes the changed data blocks during synchronization, effectively reducing the synchronization time. The amount of data

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