Read-write method for disc array data and parallel read-write method

Abstract

This invention provides one magnetic disc data reading method and one data writing method of magnetic array and in the data process, wherein, in the reading and writing process, it uses bar unit as unit reading data or writing data and computing bar unit as unit as reading and writing rules.

Description

technical field [0001] The invention relates to data reading and writing technology of a disk array (RAID), in particular to a data reading and writing method of a disk array and a parallel reading and writing method. Background technique [0002] Disk array (RAID, Redundant Access Independent Disk) technology has been applied in data storage backup as a mature technology. RAID5 (RAID LEVEL 5) is a standard for disk arrays. Figure 1 shows a RAID5 composed of 4 disks. Logically, the 4 disks are regarded as one disk for striping (Strip). In this example, the strips are divided into strips 0-3. For each stripe, three of the disks are used to store data, and the other disk is used to store the parity data of the stripe. The data distributed on each disk of each stripe is called a stripe unit (SU, Strip Unit), the strip unit can also be called a segment (Block / Segment). As for the size of the stripe unit, it depends on the system. In some systems, 1KB is the most efficient, or...

AI Technical Summary

Problems solved by technology

[0021] Although the current locking method guarantees the correctness of the read and write data, however, since the lock is performed no matter what the situation is, the read and write operations on the stripes cannot be parallelized, which affects the performance of the read and write operations.

After the command is issued during the write / read operation, the user must wait for the current operation process to end and unlock before reading / writing data on the stripe

Therefore, the locking method has a great impact on the performance of reading and writing parallel operations, which affects the reading and writing speed.

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