A non-write-back mirroring and write-through switching method for cache mirroring system

Abstract

The present invention provides a mirroring and direct-writing switching method without write-back in a cache mirroring system. The specific process is: setting a dual-controller storage system, the dual-controller storage system includes at least two controllers, and the controller supports cache mirroring , support write-mirror and write-through mode, do not support write-back mode, support switching between write-mirror and write-through mode, put dual controllers in write-mirror mode The backup data is obtained from the controller to ensure the reliability of the data; when there is only one controller left, the surviving controller performs the conversion between write-mirror mode and direct-write mode. Compared with the prior art, this non-write-back mirroring and direct-writing switching method of the cache mirroring system can switch the write-mirroring and direct-writing strategy, and abandon the write-back mode without causing disk loss, thereby ensuring storage System reliability and strong practicability.

Description

Technical field [0001] The present invention relates to the technical field of communication and information, in particular to a mirroring and write-through switching method without write-back in a cache mirroring system. Background technique [0002] Cache mirroring technology is a solution for data loss in the cache that may occur when storage processing fails. It saves the cached data on two controllers at the same time, and automatically backs up the end controller when the system is working. It is a commonly used cache protection technology in dual-controller storage systems. The basic principle is to establish cache mirroring on each controller to ensure cache consistency between dual-controllers. [0003] In storage systems that support cache mirroring, in addition to the traditional write-back (WRITE_BACK) and write-through (WRITE_THROUGH), the read-write mode also needs to increase the write mirroring (WRITE_MIRROR) mode to support the establishment of cache mirroring. [0...

AI Technical Summary

Problems solved by technology

[0005] However, in the actual storage system, when the write strategy is switched between each other, when the write mirror and write back are directly switched, due to the low efficiency of direct write, a large amount of data accumulated in the cache cannot be refreshed to the disk, which may cause write timeout, resulting in a crash

[0006] The purpose of the present invention is to provide a non-write-back mirroring and direct-writing switching method, by adding part of the processing in the switching between writing mirroring and direct writing, to solve the problem of disk loss that may be caused, so that the support of the non-writeback mode can be realized Dual-controller storage system with cache mirroring

Images