Snapshot handling method for memory system

Abstract

This invention relates to a snapshot process method in a storage system. When a pair of controllers are turned off, the snapshot control information is stored at a definite position, when it is turned on, the controller examines its own state separately then initializes the snapshot program according to the controller state or the request of the opposite controller and then designs if said data stored by the assigned position should be processed and if the mark position of the assigned position data is imaged to fetch and image data of the assigned position based on the designed mark position and begin the snapshot, the controller can begin receiving the required orders from the host. When the memory system is off suddenly, this invention can keep snapshot data of the source file at a time point so as to continue after the system is turned on.

Description

technical field [0001] The invention relates to the technical field of data storage, in particular to a snapshot processing method in a storage system. Background technique [0002] With the rapid development of science and technology, the widespread application of computer technology, the rapid increase of information on the Internet and the development of e-commerce, enterprise information systems are increasingly occupying the dominant position of enterprise competitive advantages. The massive growth of data has made enterprises more dependent on data than ever before. Therefore, protecting data security and realizing data storage backup occupies an increasingly prominent position in enterprise application systems. The current network data must be in a ready state 24 hours a day, 7 days a week, and 365 days a year. Therefore, the backup process requires no interruption of server services and minimizes the impact on data access performance. The application of storage arr...

AI Technical Summary

Problems solved by technology

However, if there is a sudden power failure during the snapshot process (for example, the external power supply of the storage device is lost), so that the storage system can only rely on the UPS power supply for a short time, since the snapshot is often a long process, the UPS power supply is difficult to support until the end of the snapshot. At this time, many existing devices, such as EMC4700, will directly terminate the snapshot

Because the source volume is still allowed to read and write during the snapshot process, the consequence of terminating the snapshot is that the snapshot data of the source volume at a certain point in time is lost and cannot be recovered, so the security of the data cannot be effectively protected