Method for managing magnetic disk array buffer storage

Abstract

The present invention discloses a management method of magnetic disk array buffer memory for reading / writing request. The management process for reading request includes the following steps: when the reading request of main machine is reached, judging that the reading request data is stored in the magnetic disk array buffer memory or not, if said reading request data is stored in said magnetic disk array buffer memory, obtaining reading request data from said magnetic disk array buffer memory and returning said reading request data to main machine, otherwise, obtaining reading request data from magnetic disk, returning it to main machine and executing step b 1; b 1 includes the following contents; judging that in the magnetic disk array buffer memory a free field is existed or not, if said free field is existed, storing reading request data in said free field, otherwise, executing step C 1; step C 1 includes the following contents; selecting reading data block in magnetic disk array buffer memory, storing the reading request data in position place of selected reading data block. For writing request of main machine said invention adopts similar method to make management.

Description

technical field [0001] The invention relates to storage management technology, in particular to a management method for disk array cache for read requests and write requests. Background technique [0002] With the development of network technology and the popularization and application of computers, the amount of data storage is increasing day by day, and people have higher and higher requirements for storage systems. This requirement is especially reflected in the storage application of key transactions. Redundant Array of Independent Disks (RAID) adopts striping and redundancy methods to improve the capacity, speed and reliability of storage systems, and has become the preferred structure for high-performance data storage. [0003] A RAID system usually includes a controller, a disk array cache, and a lower-level storage composed of multiple disks. The disk array cache is used to temporarily store the data blocks accessed by the host, so that most of the host's data acces...

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Problems solved by technology

[0036] (2) When the data blocks to be eliminated in the cache are written to the disk, the busyness of the disk channel is not considered, thereby increasing the average service time of the host write operation and reducing the throughput of the RAID system

[0037] (3) When writing the data blocks to be eliminated into the disk, the data blocks are only selected according to the host's access to the data blocks, without considering the stripes of the data blocks in the RAID system, so the pressure on the disk channels and disks is increased, and the entire data block is reduced. Performance of the RAID system

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