Method for reconstructing disk array data

A data reconstruction and disk array technology, applied in the computer field, can solve the problems of long time, array failure, time-consuming, etc., to reduce the probability of another disk failure, facilitate the recovery process, and speed up data reconstruction.

Inactive Publication Date: 2013-03-20
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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AI Technical Summary

Problems solved by technology

RAID5 supports the failure of one disk. When a disk fails and degrades, adding a hot spare disk for recovery is equivalent to performing a consistency check. The task must traverse all the data on the member disk, which is a very important task. Time-consuming work, and as the capacity of the disk increases, the process will take longer
[0003] In this process, if another disk fails, due to the redundancy mechanism of RAID5, it cannot be recovered, and the entire array will fail.

Method used

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Embodiment Construction

[0013] A method for reconstructing disk array data provided by the present invention will be described in detail below in conjunction with the accompanying drawings.

[0014] A method for data reconstruction of a disk array. The implementation process of the method is as follows: first, mark the written area, and the data in the marked area is considered as valid data. When a disk fails, add a hot spare for reconstruction ; Data without a mark is regarded as invalid data and will not be reconstructed.

[0015] The present invention considers the characteristics of different access performances in different areas of the disk. For performance optimization, a mark indicates that the size of the area is variable; it can also be changed again through setting. In order not to affect the normal IO request, the present invention saves the tag information in a non-volatile memory, which cannot be lost after power failure; in addition, it also judges the saved tag, and if it is invalid,...

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Abstract

The invention provides a method for reconstructing disk array data. Firstly, an area which is written before is marked, data in the marked area are identified as valid data, and a hot standby is added to reconstruct when a disk is out of operation. Data which are not marked are identified as invalid data, and the reconstruction is not performed. Compared with the prior art, the method for reconstructing the disk array data can accelerate the reconstruction of the disk array data, lower probability of recurrence of disk invalidation, and greatly improve reliability of a system.

Description

technical field [0001] The invention relates to the technical field of computers, in particular to a method for reconstructing disk array data. Background technique [0002] For a RAID5 system with redundant verification information, the data of each member disk cannot guarantee the consistency of the stripe data when the RAID5 is newly created. The inconsistency of the data makes the system unable to process the host IO request according to the normal process, and the obtained verification Data may be wrong, so these levels of RAID5 must first be created with consistent initialization. RAID5 supports the failure of one disk. When a disk fails and degrades, adding a hot spare disk for recovery is equivalent to performing a consistency check. The task must traverse all the data on the member disk, which is a very important task. Time-consuming work, and as the capacity of the disk increases, the process will take longer. [0003] During this process, if another disk fails, ...

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F11/16G06F3/06
Inventor 古世磊闫永刚
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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