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
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[0030] The detailed description of the system design content of the present invention is as follows:
[0031] 1. Remapping bad sectors
[0032] At present, when the RAID algorithm encounters a read and write error, it is considered that the disk is damaged and the RAID enters a degraded state. If there is a free disk, the reconstruction starts. However, under normal circumstances, a disk access error does not mean that the disk is damaged. It may be that only part of the media is faulty. The bad sector remapping module can handle these requests that fail due to media errors. It calculates the data of the wrong sector through the RAID algorithm, then redirects 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 figure below:
[0033] The algorithm of the bad sector remapping module to establish reserved sectors is as follows:
[0034] St...
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