RAID4 (redundant array of independent disks) system and data reading and writing method thereof

Abstract

The invention discloses a RAID4 (redundant array of independent disks) system and a data reading and writing method thereof. The RAID4 system comprises a RAID controller and a disc array, wherein the disk array comprises a disk array composed of a plurality of data disks and a solid hard disc used as a checking disc; the RAID controller is connected to the disk array; the data interaction betweenthe RAID controller and the solid hard disc is realized through a user-defined interface command; a cache module and an exclusive or module are arranged in the controller of the solid hard disc; the cache module is used for storing the data written in the solid hard disc by the RAID controller; and a checking updating module in the RAID controller is replaced by the exclusive or module, thereby achieving the checking information calculation function. The system is improved by using the solid hard disc as the checking disc while the corresponding data reading and writing method is provided, sothe IO (input output) operation times of the checking disc when the data is read and written are reduced, the reading and writing bottleneck problem of the checking disc is eliminated, and the property of system is promoted.

Description

technical field [0001] The invention relates to the field of computer storage, in particular to a RAID4 system and a data reading and writing method thereof. Background technique [0002] RAID (Redundant Access Independent Disks, redundant array of independent disks) technology has been widely used in data storage as a mature technology. RAID technology has seven basic RAID levels ranging from RAID0 to 6. Different RAID levels represent different storage performance, data security and storage costs. Among them, RAID4 is developed on the basis of RAID3. Such as figure 1 As shown, in the RAID4 mode, the disk array includes N disks for storing data (referred to as data disks) and a disk dedicated to storing parity information (referred to as parity disks), which is based on stripes (Data striping) , while the file data is divided into blocks and written into a data disk, calculate their parity values ​​for all data blocks in the same disk position as the data block in other ...

AI Technical Summary

Problems solved by technology

[0004] It can be seen that the bottleneck problem of the verification disk of the RAID4 system using SSD as the verification disk still exists. , the verification disk needs to be updated. Even though the read and write speed of SSD is faster than that of mechanical hard disk, the response ability of the verification disk for large data update operations still determines the IO responsiveness of the entire system.

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