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Disk array three-stage recovery system designing method

A disk array and recovery system technology, applied in the direction of responding to the generation of errors, input/output to the record carrier, etc., can solve the problems of disk array performance, reliability impact, long time consumption, etc., to improve the speed and system reliability, The effect of reducing the impact of responsiveness and ensuring reliability and performance

Inactive Publication Date: 2013-04-24
LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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Problems solved by technology

[0003] At present, for the data loss problem caused by the damage of the internal disk of the disk array, only reconstruction is the processing method. However, the reconstruction of the disk array takes a long time, and the performance and reliability of the disk array are seriously affected during the reconstruction process. Therefore, a new disk array is proposed. It is necessary to restore the system design

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Embodiment

[0030] The system design content of the present invention is described in detail as follows:

[0031] 1. Bad sector remapping

[0032] At present, when the RAID algorithm encounters a read / write error, it considers the disk damaged, and the RAID enters a degraded state. Start rebuilding if there is a free disk. However, under normal circumstances, a disk access error does not mean that the disk is damaged, and it may be that only some media have errors. The bad sector remapping module can handle these failed requests due to media errors. It calculates the data of the wrong sector through the RAID algorithm, then redirects it to the reserved area, and modifies the sector mapping table; when the next request arrives, The correct data can be obtained by looking up the sector mapping table, as shown in the following figure:

[0033] The algorithm of the bad sector remapping module to establish the reserved sector is as follows:

[0034] Step 1 sends the user request to the sp...

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Abstract

The invention provides a disk array three-stage recovery system designing method for a redundant array of independent disks (RAID) reconfiguration module and relates to the field of disk array data recovery. A system adopts a three-layer recovery structure and can quickly recover the RAID and decrease the RAID reconfiguration times. The technical scheme is that the method comprises the steps of bad sector region remapping, disk data migration and RAID reconfiguration. Compared with existing disk array reconfiguration technologies, the RAID reconfiguration module system effectively overcome the detects including long reconfiguration time of disk arrays and poor system response capacity, reduce the influence of the disk arrays to the response performance in long-term reconfiguration and improve the reliability of the RAID system.

Description

technical field [0001] The invention relates to the field of disk array data recovery, in particular to a design method of a disk array three-level recovery system. Background technique [0002] Storage occupies a vital position in an enterprise unit. Redundant Array of Disks (RAID) is widely used as a storage method with high reliability and high performance. When a single member disk in the RAID array fails, the RAID coding method uses redundant disks to reconstruct the faulty system, but this process will affect the performance of the system's normal requests due to additional disk reads and writes and calculations. As the capacity of a single disk increases, the recovery time of the system will also increase, thereby increasing the probability of a second disk error. Shortening the reconstruction time is an effective way to reduce the impact of reconstruction on disk array performance and improve system reliability. [0003] At present, for the data loss problem cause...

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Application Information

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IPC IPC(8): G06F11/07G06F3/06
Inventor 陈宗勇唐远琳
Owner LANGCHAO ELECTRONIC INFORMATION IND CO LTD
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