Optimization processing method for error correcting code in solid state disk system and application of optimization processing method

Abstract

The invention discloses an optimization processing method for an error correcting code in a solid state disk system. The optimization processing method is characterized by comprising the steps of combining a plurality of continuous logic data pages into a data page group, storing data pages and overlong error correcting codes in a flash memory according to a page view, and intensively storing the overlong error correcting codes of a data page group in the flash memory into a special flash memory page. According to the method, the read-write visiting time is saved, the problems of read amplification and high visit expense caused when the data pages in the other flash memory page are read are avoided, and the integral performance of a solid state disk is optimized. The invention further discloses application of the optimization processing method. By virtue of the method, the read and write caching algorithms are optimized; by caching the overlong error correcting codes, the cache hit ratio is increased; and by virtue of batch write-back of the overlong error correcting codes of multiple data pages, the updating expense is reduced, furthermore, the integral performance of the system is improved, and the service life of the solid state disk is prolonged.

Description

technical field [0001] The invention belongs to the technical field of solid-state disk storage, and in particular relates to a method for optimizing error correction codes in a solid-state disk system and an application thereof. Background technique [0002] Solid state disk (SSD) is an emerging storage technology with a global market worth tens of billions. With flash memory as the storage medium, it has lower latency and energy consumption, faster data processing speed, better shock resistance, higher reliability and durability. In order to obtain larger storage capacity and higher storage density, flash media has been optimized in three aspects: process, organizational structure, and number of storage bits. However, the shrinking of the size of memory cells leads to an increase in inter-unit crosstalk; the continuous increase in the number of stacked layers also increases inter-layer crosstalk; and the change in the number of bits stored in flash memory cells narrows th...

AI Technical Summary

Problems solved by technology

There are obvious deficiencies in the use of strong error-correcting codes with check lengths on existing flash memory, specifically as follows: on the one hand, strong error-correcting codes usually require longer redundancy, and the redundant space provided by flash memory pages may not be enough to store All error correction codes; on the other hand, a logical data page needs to be stored on two flash pages across pages, which will cause read amplification problems, resulting in high access overhead and reducing the overall performance of the SSD

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