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

Abstract

The embodiment of the invention provides a method for copying data as well as a method, device and system for reading the data. The method for copying the data comprises the steps: confirming a data copying speed of copying data to a cache region according to the access frequency of the cache region, the load of a magnetic disc and the load of the cache region when the access frequency of the cache region is not more than a high frequency threshold value; and copying the data from the magnetic disc to the cache region according to the copying speed. The method for reading the data comprises the steps: judging whether read request access data are memorized in the cache region after receiving the read request which is used for accessing the magnetic disc; and confirming to read the read request access data from the cache region or the magnetic disc according to the load factor of the magnetic disc and the access balance rate of the cache region when the read request access data are memorized in the cache region. The embodiment of the invention is good for improving the overall performance of a memory 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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