Method and device for increasing magnetic disc redundant array redundancy

Abstract

The invention provides a method and device for increasing the magnetic disc redundant array redundancy. In the method, blocking partitions in each braid of the RAID after the array conversion can be increased via increasing the new member magnetic disc, the partitioning data in the migrated process in the original member magnetic disc is saved by utilizing increased blocking partitions, and the check bit of the braid is stored in the spacing after migrating, consequently, each blocking partition in the braid can not be migrated. according to the invention, the necessary data bulk can be reduced in the treating process for increasing the RAID redundancy, thus quickening the switching speed of the RAID array, and being capable of avoiding the problem of insufficient RAID memory space caused because of increased redundancy in the prior art.

Description

technical field [0001] The invention relates to the technical field of Redundant Array of Independent Disks (RAID, Redundant Array of Independent Disks), in particular to a method and device for increasing RAID redundancy. Background technique [0002] RAID technology has been widely used in various occasions of data storage. RAID is aggregated by multiple disks, which can provide higher access speed and better availability while providing large capacity. Wherein, the disks in the RAID are referred to as member disks of the RAID. The following briefly introduces the related concepts of RAID: [0003] A partition (Extent) is a storage block with consecutive addresses on a disk. A disk can be divided into multiple partitions, and each partition can be of equal size. Partitions are also sometimes called logical disks. [0004] Block (Strip), divide a partition into multiple blocks of equal size and adjacent addresses. These blocks are called blocks. Chunks are generally t...

AI Technical Summary

Problems solved by technology

Compare figure 2 and image 3 , it can be seen that according to the processing method of the prior art, a large amount of block data in the RAID needs to be migrated, and the data of each block in each stripe has been migrated. When there is no redundancy, the amount of data to be migrated is very large, so the time required for array conversion is also relatively long

In addition, since each stripe needs to add corresponding blocks to store the parity bits, resulting in an increase in the number of converted stripes, the effective storage space of the array will also be reduced by 1 / N (N is the number of member disks) , in severe cases, it may also lead to insufficient storage space after conversion, resulting in loss of original data or conversion failure

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