Snapshot system for network storage and method therefor

Abstract

The invention discloses a storage area network (SAN) system and a snapshot method used in the same system. The inventive system comprises a snapshot controller connected with main server, reference server and storage device. Wherein the main server includes an agent snapshot device which works with volume device; the reference server includes a logic block and a snapshot device which is related to the original disk space data block. Before the main server writes new data into the original disk space, the snapshot agent device sends copy on write (COW) request to the snapshot controller; the snapshot controller copies the original data on the original disk space to the snapshot space, creates corresponding relationship between the original data block on the original data space and the data block on the snapshot space, and makes write market on the snapshot device logic block that corresponds to the original data block on the original disk space. The invention realizes the high-frequency snapshot based on physical data blocks in SAN environment, and keeps the safety and consistency of the original disk data.

Description

technical field [0001] The present invention relates to a snapshot system and method in network storage, in particular, to a snapshot system and method in a storage area network (SAN). Background technique [0002] At present, information has become an important part of modern enterprise assets. With the rapid growth of enterprises and their customers' dependence on data, the online reliability and availability of data storage is increasingly becoming a key link in the informatization process. It becomes very important to ensure data security and improve data usage efficiency. The problem that large enterprises and institutions often need to face is how to ensure the availability and effectiveness of their data in the case of various disasters, software and hardware abnormalities and human damage. [0003] The basic means of ensuring data availability and security is data replication and backup. For a long time, traditional offline backup, off-site storage of backup media ...

AI Technical Summary

Problems solved by technology

In this way, the use of virtual volumes is greatly limited for most projects where it is actually impossible, inconvenient or unnecessary to use virtual volumes; moreover, this type of snapshot technology is anti-snapshot, that is, when taking a snapshot, it redirects the data generated by the working host operation, write to the snapshot device

Therefore, under some extreme conditions, such as a sudden power failure, it is difficult to guarantee the integrity of the original disk data, and there are technical risks

When deleting the snapshot, the data on the snapshot device needs to be written back to the original device, which has an impact and influence on the original disk; moreover, the snapshot frequency of this type of snapshot technology is low, and the minimum snapshot interval that can be achieved is relatively low. long, more than 10 minutes

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