Fast photographic system and method

Abstract

A snapshot system comprises processing unit of read / write request, physical storage resource of logic roll, basic roll recording and said logic roll with its interactive interface unit, snapshot roll recording and said logic roll with its interactive interface unit. It is featured as not only supporting to create snapshot on normal logic roll but also supporting to create snapshot on snapshot itself.

Description

Technical field [0001] The present invention relates to the technical field of computer storage, in particular to a snapshot system and method that not only supports snapshots based on initial data, but also supports snapshots based on the snapshot image itself. Background technique [0002] In the field of computer storage technology, the application requirements for obtaining a data map at a certain moment are very common. This kind of instant data mapping is also called "snapshot". Snapshots are widely used in data backup and recovery, data statistics and analysis and other fields. [0003] One widely used technique for obtaining snapshots is Copy-On-Write. When creating a snapshot, the copy-on-write technology does not copy all the contents of the initial data of the created snapshot to obtain a data image copy, but creates a data structure that records the modification of the initial data and a snapshot space for saving the data. Therefore, the snapshot creation process is v...

AI Technical Summary

Problems solved by technology

How to apply the snapshot technology to the data images generated by the snapshot technology again, that is, "snapshot-based snapshots", especially the repeated iteration of this snapshot logic (such as creating snapshots again for "snapshot-based snapshots"), has not yet been very clear. good way to solve this problem

[0008] In addition, some snapshot logical volumes in the prior art only support read operations, which limits the way snapshots can be applied

Images