A method and system for efficiently utilizing solid-state disk cache

Abstract

The invention discloses a method for efficiently utilizing a solid-state disk for caching. The method comprises the steps that the solid-state disk and a mechanical disk which are different are made into a unified mixed logic device, a space is initialized in a memory of a target device of a mapping layer of the mixed logic device and serves as a miss window, a very small log area is arranged on the mechanical disk and used for caching a lower-case request reaching the disk, the caching space of the solid-state disk is divided into a plurality of groups to receive a request from a user, whether the request is a read request or a write request is judged, the number of the cache group, corresponding to the read request, in the caching space of the solid-state disk is computed according to the access address corresponding to the read request, and whether a data block corresponding to the read request exists in the cache group corresponding to the obtained number of the cache group or not is searched. Arrived request sequences are detected through a dual-threshold method, and a transparent block-class device with high performance, large capacity and low power consumption is provided for the user.

Description

technical field [0001] The invention belongs to the field of computer data storage, and more particularly relates to a method and system for efficiently utilizing solid-state disk cache. Background technique [0002] The increasing maturity of solid-state disk technology provides a potential solution to the I / O bottleneck problem in computer systems to a certain extent. SSDs are far superior to mechanical disks in terms of performance, especially random access performance, and energy consumption. The operation time required for its data access often only takes tens of microseconds One to two orders of magnitude faster than the millisecond (ms) access time of mechanical disks. Moreover, the energy consumption in the solid state disk is far less than that of the mechanical disk. [0003] SSDs have been used to build storage systems in some high-performance computing environments. However, SSDs also have their drawbacks and limitations. Its random write performance, espec...

AI Technical Summary

Problems solved by technology

Therefore, from the perspective of capacity, long-term reliability, and cost, building a large-scale storage system based entirely on solid-state disks will not be able to obtain the best cost performance under current technical conditions.

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