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 system. The system includes a snapshot controller connected with a main server, a reference server and a storage device. The main server includes a snapshot controller working under a volume device. The snapshot proxy device, the reference server includes a snapshot device whose logical block is associated with the original disk space data block; before the master server writes new data to the original disk space, the snapshot proxy device sends a copy-on-write (COW) to the snapshot controller request, the snapshot controller copies the original data in the original disk space to the snapshot space, establishes the corresponding relationship between the original data blocks in the original disk space and the data blocks in the snapshot space, and performs a logical Blocks are copy-on-write marked. The invention realizes the high-frequency snapshot based on the physical data block in the SAN environment, and ensures the security and consistency of the original disk data.

Description

technical field [0001] The 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 process of informatization. It is very important to ensure data security and improve data use efficiency. The problem that large-scale enterprises and institutions often need to face is how to ensure the availability and effectiveness of their data in the event of various disasters, software and hardware abnormalities, and man-made damage. [0003] The basic means to ensure data availability and security are data replication and backup. For a long time, traditional methods such as offline backup and off-site storage...

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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