Magnetic disk cache system based on solid-state disk

Abstract

The invention discloses a magnetic disk cache system based on a solid-state disk and belongs to the technical field of cache systems in computer data storage systems. The magnetic disk cache system based on the solid-state disk comprises a data block metadata maintenance module, a solid-state disk data replacement module and a dirty data block writing-back disk module. According to the magnetic disk cache system based on the solid-state disk, the reading and writing performance of disk data in a large-scale storage environment is improved through the solid-state disk, and the data block reading and writing hit rate and the cache space utilization rate are high; meanwhile, it is guaranteed that data blocks cached under the condition that a computer is restarted due to faults can not be lost easily, the cold-to-hot convergence time of solid-state disk equipment is shortened, and the problems that according to a computer data storage system in the prior art, the cache space is limited, cached data can be lost easily, and the cache space can not be fully utilized can be solved.

Description

technical field [0001] The invention belongs to the field of computer data storage, and more specifically relates to a disk cache system based on a solid-state disk, which is used to improve the read-write performance of the disk. Background technique [0002] Although Solid State Disk (SSD for short) is superior to traditional mechanical disks (HDD) in terms of performance, energy consumption, and reliability, it has the disadvantages of limited capacity and lifespan in addition to the disadvantages of high cost. The main barriers to its widespread adoption. [0003] Although the performance of mechanical disk (HDD) is severely limited due to its mechanical seek operation, especially its random access performance, its advantages such as low cost, high capacity, and infinite long life will still ensure its important role in modern storage systems. . [0004] Based on the complementary advantages and disadvantages of these two types of storage devices, building a hybrid sto...

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Problems solved by technology

[0005] Existing storage systems based on solid-state disks either use solid-state disks to build a layered storage system, and store hotspot data on solid-state disks to speed up access to data by upper-layer applications, but the size of hotspot data using this method Limited by the size of the storage space of the solid state disk, the improvement of the read and write performance of the storage system is limited

Either design a hybrid storage system based on solid-state disk cache, and the traditional storage system built using solid-state disk as cache has better performance improvement in the case of a stand-alone machine, but it will cause solid-state disk in a distributed system. waste of storage space

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