Data reading-writing method and device of magnetic disk array

Abstract

The invention provides a data reading-writing method and device of a disk array. The method comprises the following steps of: according to address information in a reading-writing command, judging whether the reading-writing command is used for reading or writing data in a first region on a hard disk group, wherein the storage space of each hard disk group is divided into a first region and a second region, the first region is used for providing pre-set grade redundant storage for critical data, the second region is used for storing non-critical data, the first region and the second region include at least one LUN (Logic Unit Number), respectively; if yes, starting the pre-set reading-writing policy for reading or writing the data in the first region; and if not, starting the non-preset grade reading-writing policy for reading or writing the data in the second region on each hard disk group. By adopting the technical scheme, the non-critical data is written in the residual space of a hard disk actually, thus utilization rate of the hard disk space is improved, and storage cost is reduced.

Description

technical field [0001] The embodiment of the present invention relates to a data reading and writing technology of a disk array, in particular to a method and device for reading and writing data of a disk array. Background technique [0002] As a mature technology, Redundant Array of Independent Disks (Redundant Array of Independent Disks; RAID for short) has been widely used in data storage backup. Redundant array of mirrored independent disks RAID1 (RAID LEVEL 1) is a standard of RAID. It is a RAID disk array composed of two hard disks. Its principle is to automatically copy 100% of the data written by users to one of the hard disks to the other hard disk. On the other hand, it has high data security due to the 100% backup of the stored data. In many application scenarios, customers choose to use RAID1, a high-performance, high-reliability redundancy algorithm, to protect critical data. For example, a "data safe" is often used to protect the operating system (Operating Sy...

AI Technical Summary

Problems solved by technology

[0004] The embodiment of the present invention provides a method and device for reading and writing data of a disk array, which is used to solve the defect that the remaining space in the hard disk cannot be effectively used in the prior art, improve the utilization rate of the hard disk space in the disk array, and reduce storage costs

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