RAID5 (redundant array of independent disk 5) write IO optimization processing method

Abstract

Disclosed is an RAID5 (redundant array of independent disk 5) write IO optimization processing method. The method includes following steps: 1), storage system creation; 2), data reading and writing operation; and 3), failure data block recovery and has the advantage of capability of effectively lowering write amplification effect of RAID level disk arrays. For conventional magnetic disks, sequential write performance is much higher than random write performance. The address mapping method enables random write operation to be converted into sequential write operation, write performance of the magnetic disk is effectively brought into play, IO operation needed for computation checking is lowered, and response capability of an RAID system is evidently improved, and power consumption of the system is lowered. In addition, an address mapping module can flexibly choose arrangement positions and the number of checking blocks, so that the RAID5 write IO optimization processing method is not limited to be applicable to disk arrays of RAID5 level and can be popularized for realization of RAID4 and RAID6 levels.

Description

technical field [0001] The invention relates to the field of computer data storage, in particular to a RAID5 writing IO optimization processing method. Background technique [0002] Disk array 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 RAID 0 to 6. Different RAID levels represent different storage performance, data security and storage costs. RAID includes N+P hard disks for storing data. It is based on stripes. While dividing file data into blocks and writing them into a data disk, all data blocks in the same disk position as the data block in other data disks Calculate their parity values ​​(XOR operation), and finally form an information block (check block) composed of parity values, and write it to the hard disk at the corresponding location, which is called data protection. Its advantage is that it prov...

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Problems solved by technology

[0008] The object of the present invention proposes a kind of write IO optimization processing method of RAID5, adopts the address mapping method of data block when a kind of optimized write operation is adopted, RAID controller is The address mapping table is established for the data block. The LBA address of the host is no longer fixedly corresponding to the hard disk, but the LBA address of the host is rearranged according to a special algorithm, so that the write operation of the random address is converted into the write operation of the sequential address to achieve data writing. There is no need to read out the original data block and the original check block when writing data blocks. This method greatly reduces the number of IO operations of the check disk when writing data, effectively eliminates the write amplification effect of the check disk, and solves the problem of poor write performance of existing RAID5 disk arrays. High problem, optimize disk array effective performance

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