Method and device for treating bad sector in RAID5 disk array

Abstract

The invention provides method and device for treating a bad sector in an RAID5 disk array, and belongs to the technical field of data error tolerance storage. The method is that a reserved disk is added to the RAID5 disk array, and the bad sector in the disk is marked with an array bitmap; as reading-writing reaches the bad sector, the data in the bad sector are transferred to the same position in the reserved disk, and the bitmap is set at the same time; and as bitmap scanning reaches the bad sector, the reading-writing operation is performed from the same position in the reserved disk. The method and device for treating the bad sector in the RAID5 disk array improve the storage performance and reliability of the RAID5 array.

Description

technical field [0001] The invention relates to a data fault-tolerant storage technology, in particular to a method and a device for repairing bad sector lost disks and fast reconstruction in a RAID5 disk array. Background technique [0002] RAID technology is to use relatively small-capacity disks to form a large-capacity disk array according to certain rules to provide external storage resources. RAID (Redundant Array of Independent Disks) is called Redundant Array of Independent Disks. [0003] The main purposes of using RAID are: [0004] (1) Redundant storage of data on the disk to achieve fault tolerance; [0005] (2) When there is an I / O request, the disk can be accessed concurrently to improve the throughput. [0006] RAID5 supports redundancy, and stores verification information on all disks in the array. Its verification and technology uses XOR verification in disk stripes, which is called "using block cross access and uniform distribution of verification informa...

AI Technical Summary

Problems solved by technology

However, when a RAID5 array is fully reconfigured, it is equivalent to performing a synchronous check on all the data in the entire array space. The whole work is time-consuming and labor-intensive, which not only affects the read and write performance of the array, , and another disk has a bad sector, the disk with the bad sector will be removed from the RAID5 array, causing two disks to be lost in RAID5, the entire array will fail, and all data will be lost

[0012] The full-disk reconstruction operation of the hot spare disk in RAID5 not only affects the read and write performance of the array, but also affects the reliability of the array

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