Method for scanning disk array

Abstract

The invention discloses a method for scanning a disk array. The method comprises the following steps: a partitioning step, namely dividing disks into a plurality of areas; a scanning step, namely scanning all the areas in a skipping manner till all the areas are scanned as a scanning period, wherein in the scanning period, only once scanning operation is executed for each area, and for each area, only one data block is scanned during each scanning operation; and continuously executing the scanning step till scanning all the data blocks in all the areas in a traversing manner as a once traversed scanning process, wherein in the once traversed scanning process, non-repetitive scanning is carried out on the data blocks of the areas at different scanning periods. The method disclosed by the invention has the advantages that under the premise of not influencing the services, the reliability of the disks, potential bad tracks in the disks can be discovered and processed as early as possible, so that the probability of double-disk failure and data loss caused by the bad tracks is reduced.

Description

technical field [0001] The invention relates to data protection of disk arrays, and in particular, to a method for scanning disk arrays. Background technique [0002] In a disk array, if the RAID (Redundant Array of Independent Disk, redundant independent disk array) is rebuilt for many times, the problem of double disk failure may be triggered, resulting in loss of user data. This problem is very serious in large disk arrays. The reason is that potential sector errors are the main abnormality, and bad sectors are not actively reported. Bad sectors can only be found when reading and writing. Therefore, if the data on bad sectors is not read and written, bad sectors cannot be found. For example, RAID5 Before the reconstruction occurs, if the bad sectors on other member disks are not discovered in advance, a double-disk failure will occur during the reconstruction of the RAID group. [0003] Hard disk bad sectors are unavoidable, but they can be found in time, and then the da...

AI Technical Summary

Problems solved by technology

[0011] First of all, the scanning range is not comprehensive enough, and it is easy to miss scanning bad sectors. For example, on a RAID5 disk array that does not support double-disk failure, when one disk fails, in the process of reconstructing data, if another piece of data fails If there are bad sectors on the disk, the RAID5 array will fail

[0012] Secondly, because it is a random scan, there is no regularity when scanning, which will cause some sectors of the disk to be read multiple times in one scan cycle, while some sectors are not read in multiple scan cycles. is scanned, which causes a waste of scanning resources and poses a serious challenge to the reliability of the entire disk array

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