Method for rebuilding data of magnetic disk array

A disk array and data reconstruction technology, which is applied in the direction of redundant code error detection, response error generation, etc.

Active Publication Date: 2010-06-30
HUAZHONG UNIV OF SCI & TECH
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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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  • Method for rebuilding data of magnetic disk array
  • Method for rebuilding data of magnetic disk array
  • Method for rebuilding data of magnetic disk array

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Embodiment Construction

[0053] The present invention will be described in further detail below in conjunction with the accompanying drawings.

[0054] figure 1 It is a schematic diagram of the relationship between each step of the present invention: when a member disk in the disk array fails, take out the faulty disk, add a new replacement disk, and enter the rebuilding step and the request processing step of the rebuilding stage at the same time, and enter the data recovery step and the rebuilding step at the same time. Request processing steps in the reclamation phase until the reclamation is complete.

[0055] Such as figure 2 As shown, in the redirected data log table, each log is composed of 4 data items; each data item is the block offset address D of the redirected data in the rebuilding disk array, the redirected data in the proxy disk array The block offset address S, the length L of the redirected data, and the flag bit F, the flag bit identifies whether the redirected data is write dat...

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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...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G06F11/10
Inventor 冯丹吴素贞毛波田磊曾令仿陈俭喜
Owner HUAZHONG UNIV OF SCI & TECH
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