Method for copying data as well as method, device and system for reading data

Abstract

Provided are a method for copying data, and a method, device and system for reading data. The method for copying data includes: determining the copy speed of copying data into a cache area according to the access frequency of the cache area, the load of the disk and the load of the cache area when the access frequency of the cache area does not exceed the high-frequency threshold; and copying data from the disk to the cache area according to the copy speed. The method for reading data includes: after having received a read request for accessing the disk, judging whether there are data accessed by the read request in the cache area; determining to read the data accessed by the read request from the cache area or the disk according to the load rate of the disk and the access equilibrium rate of the cache area when there are data accessed by the read request in the cache area. It is advantageous for improving the overall performance of the storage system.

Description

technical field [0001] Embodiments of the present invention relate to storage technologies, and in particular, to a method for copying data, a method and device for reading data, and a system. Background technique [0002] Solid State Disk (Solid State Disk or Solid State Drive), also known as electronic hard disk or solid state electronic disk, is a hard disk composed of a control unit and a solid state storage unit, where the solid state storage unit can be Dynamic Random Access Memory (DRAM) Or memory chips such as flash memory (FLASH). Compared with ordinary hard disks, solid-state drives have the following advantages: fast start-up, no motor acceleration process; no magnetic head, fast random read, very small read delay; relatively fixed read time. Because SSD seek time is independent of data storage location, disk fragmentation does not affect read time. [0003] In a storage system using SSD as a cache (cache), all access areas are divided into several data blocks a...

AI Technical Summary

Problems solved by technology

[0004] However, in the existing SSD cache storage system, when accessing the data stored in the SSD, it only reads from the SSD, so the performance of the entire storage system to read data depends entirely on the read performance of the SSD disk; in addition, copying data to the SSD When hot data is used, the timing and speed of copying data are not considered

Therefore, the overall performance of the existing storage system is low

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