Multi-controller cache mirroring method and system

Abstract

The invention discloses a multi-controller cache mirroring method and system. The multi-controller cache mirroring method comprises the steps of numbering n controllers in a storage system from 1 to n, wherein n is greater than or equal to 3; backing up data of the i-1 controller in the i controller and backing up data of the n controller in the first controller, wherein i is greater than or equal to 2 but less than or equal to n; and when the i controller is in fault, backing up the data of the i-1 controller into the i+1 controller. The multi-controller cache mirroring method realizes and guarantees backups of the data in each controller at each moment, and efficiently improves usability and reliability of a multi-controller storage system.

Description

technical field [0001] The invention relates to the technical field of storage systems, in particular to a multi-controller cache mirroring method and system. Background technique [0002] At present, with the advent of the digital age, in people's daily life and scientific research, more and more traditional businesses have begun to be digitalized and networked, prompting the explosive growth of data, and the status of storage systems in the entire business processing system is becoming more and more important. In order to increase the availability and reliability of the storage system, various storage manufacturers have launched their own dual-controller and four-controller storage products one after another. The controllers can back up each other. After one or more controllers fail, the remaining controllers still It can provide storage services and ensure that data will not be lost and user services will not be interrupted; it is of great significance to improve the avai...

AI Technical Summary

Problems solved by technology

For four-controllers, there are usually two backup methods. One is that two controllers form a group, and the four controllers are divided into two groups. The controllers in the group back up each other, and there is no backup between groups. The advantages of this method It only needs to be completed between two controllers, and the performance of writing IO is high. The disadvantage is that after one controller in the group fails, the remaining controllers no longer have backups, and there is a risk of data loss; the second method The four controllers back up each other. Only after the write IO operations of the four controllers are all completed, the storage end returns the completion of the write IO operation to the server end. The advantage of this method is that all four controllers have data backup, which is reliable. High performance, the disadvantage is that an IO write operation needs to be written four times to complete, which seriously reduces the performance of writing IO

Therefore, the availability and reliability of the storage system are low

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