Method for rebuilding data of magnetic disk array

Abstract

The invention provides a data reconstruction method for disk array, which belongs to computer data storage methods and solves the problems that disk array data reconstruction consumes excessive time and affects the reading-writing performance and reliability of systems. The method consists of a reconstruction stage and a recovery stage in sequence, wherein an agent disk array is arranged outside a disk array during reconstruction; a user control interface, a reconstruction module, a space management module, a hot data identification module, a request redirection module, a data recovering module, a redirection data log table and a non-hot data chain list are arranged on the disk array during reconstruction; the reconstruction stage comprises a reconstruction step and a reconstruction-stagerequest processing step which are concurrent; and the recovery stage comprises a data recovering step and a recovery-stage request processing step which are concurrent. The method has the advantages of accelerating reconstruction speed and reducing the access response time of users, does not change reconstruction process or the data distribution mode of the disk array, and is suitable for constructing the storage systems with high performance, availability and reliability.

Description

technical field [0001] The invention belongs to computer data storage methods, in particular to a disk array data reconstruction method. Background technique [0002] With the development of computer technology and network communication technology, the degree of informatization is getting higher and higher, and people's requirements for data reliability are getting higher and higher. Redundant Array of Independent Disks (RAID) is a typical device in the field of reliable storage systems. Compared with a single disk, the performance, availability and reliability of the disk array have been greatly improved. Among them, mirroring, parity Test, hot backup, etc. are commonly used fault-tolerant technologies for disk arrays. When a member disk in the disk array fails and a new disk is added, the disk array can automatically switch to the reconstruction mode, and the reconstruction process continuously restores the data blocks on the failed disk to the newly added disk without in...

AI Technical Summary

Problems solved by technology

[0005] This invention proposes a disk array data reconstruction method, which redirects all write requests and hot read requests received during the disk array reconstruction process to the proxy disk array In this method, the contradiction between reconstruction requests and user requests for disk resources is alleviated, and the existing disk array data reconstruction method takes too much time and affects the read-write performance and reliability of the storage system.

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