Writing-in and reading method of solid-state memory system flash translation layer (FTL) with compression function

Abstract

The invention provides a writing-in method of a solid-state memory system flash translation layer (FTL) with a compression function. A solid-state memory system comprises a pre-compression cache, a data compression unit, a post-compression cache, an address mapping table, a data compression FTL and a memory unit. The writing-in method comprises that the solid-state memory system receives and resolves a writing-in instruction; the solid-state memory system caches data to be written in the pre-compression cache; the data compression unit performs data compression of the data in the pre-compression cache and memorizes compressed data in the post-compression cache; the data compression FTL can perform address mapping management, garbage collection, loss balance and the like to compressed data blocks with variable length; and the solid-state memory system writes the compressed data in the post-compression cache in the memory unit. The writing-in method can enable the solid-state memory system to have the built-in compression capacity and the FTL with the compression function, and can improve memory space utilization rate of the solid-state memory system and avoid memory space waste.

Description

technical field [0001] The present invention mainly relates to the field of solid-state storage systems, in particular to a writing and reading method capable of improving the storage space utilization rate of the solid-state storage system. Background technique [0002] The solid-state storage system using NAND Flash has gradually become a new popular storage system (Solid State Disk, SSD). However, since the service life of Flash is limited (25nm MLC erasing times are about 3000 times), how to reduce the erasing times of Flash is an important research direction in SSD. The use of data compression technology can greatly reduce the amount of data actually written into the SSD, thereby reducing the number of erasing and writing to the Flash and prolonging its life. [0003] For example, general executable files, text files, and database files can generally be reduced in volume by 30% to 60% after lossless data compression, and the required storage space is greatly reduced. ...

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Therefore, the 2KB storage space of this internal fragment is wasted

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