Disc array reconstruction method

Abstract

The invention discloses a disc array reconstruction method, comprising: during disc array raid reconstruction, only reconstructing a stripe corresponding to a data unit on a lost member disc instead of reconstructing a stripe corresponding to a checkout unit on the lost member disc; and when data are written in a stripe which does not finish reconstruction subsequently, writing data in the strip in the mode of reconstruction, and reconstructing the checkout unit on the lost member disc. The method only reconstructs the data unit on the lost member disc instead of reconstructing the checkout unit so as to reduce the data amount required to reconstruct and realize the purpose of quickening raid reconstruction. The method does not need to add additional system load when raid is normally used, a data written-in mode is changed into a reconstruction written mode when the stripe which does not finish reconstruction is written in, so that the checkout unit on the lost member disc can be reconstructed, thus gradually finishing reconstruction.

Description

technical field [0001] The invention relates to the technical field of storage, in particular to a method for rebuilding a disk array. Background technique [0002] A disk array (RIAD) is a parallel read-write storage system composed of multiple disks (ie, member disks). In the raid system, all member disks are combined to form a virtual disk with a large storage space. The virtual disk is divided into stripes, and the storage unit of each stripe (stripe unit) corresponds A storage space on the same offset address of the disk. In raid5 and raid6, one or two stripe units are reserved for saving verification data in each stripe. This stripe unit is called a verification unit, and the remaining units on the stripe are called data units. figure 1 It is a schematic diagram of the stripe structure of raid5, such as figure 1 As shown, the raid is composed of 5 member disks, the part covered by the slash is the verification unit, and the others are data units. [0003] The recon...

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Problems solved by technology

[0005] However, the disadvantage of the above algorithm is that the log system needs to be updated in real time during the normal data writing process of the raid system, which obviously increases the load of the raid system in disguise and affects the performance of the raid system during normal use.

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