Method, device and system for accessing solid state disk space

Abstract

A method, device and system for accessing a solid state disk space. The solid state disk (SSD) space comprises at least two subgroups, and each subgroup is a subgroup obtained by equally dividing several block SETs contained in the SSD space; wherein the SETs in each of the subgroups have the same index number, and the SETs having the same offset in at least two subgroups belong to the same logic subgroup. The method comprises: mapping a block request for accessing the disk space to a first logic subgroup in the SSD space; acquiring the index number of the first SET mapped from the block request in the first logic subgroup by means of the mapping function; and writing the block request into the first SET. The embodiments of the present invention group the SSD space, thereby mapping the block request to a certain logic subgroup divided. Because each logic subgroup comprises a number of SETs identical to the number of the subgroups, uniform access to the SSD space is achieved, and the caching efficiency and the use efficiency of the SSD are improved.

Description

technical field [0001] The invention relates to the field of storage technology, in particular to a method, device and system for accessing the space of a solid-state hard disk. Background technique [0002] A data center usually consists of three parts: servers, networks, and storage devices. In the existing technology, solid state disks (SolidStateDisk, SSD) are gradually used to replace traditional disks as storage devices. SSDs are hard disks made of solid state electronic chip arrays. They are composed of a control unit and a storage unit. The storage unit is responsible for storing data, controlling The unit is responsible for reading and writing data. Since SSD does not contain mechanical parts, it does not require seek operations and has good random read and write performance. However, since SSDs are more expensive than traditional disks, SSDs are usually used as caches for traditional disks to speed up users' access to disks. Due to the limited capacity of the SS...

AI Technical Summary

Problems solved by technology

[0005] Embodiments of the present invention provide a method, device and system for accessing solid-state hard disk space, so as to solve the problem of low cache efficiency and use efficiency of SSD in the prior art

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