User write request processing method of solid state disk adaptive to flash page difference

Abstract

The invention discloses a user write request processing method of a solid state disk adaptive to flash page difference. The method comprises the steps of, according to difference among flash pages, classifying the flash pages into different page types; according to a classification method of the flash pages and a page type designation strategy, designating a page type for a user write request in adevice-level I / O queue; cutting the user write request into sub-requests taking the sizes of the flash pages as units; according to a page assignment strategy designated by the page type, assigning aphysical flash page used for serving the sub-request to each sub-request, and inserting the sub-requests successfully assigned with the physical flash pages into corresponding flash chip queues; extracting the sub-requests from the flash memory chip queues, and finishing data transmission and writing; and after all the sub-requests involved by the user write request are completed, returning a user write request processing result. By use of the method, the flash conversion layer design of the solid state disk can be adaptive to the difference among the flash pages, so that the purposes of optimizing the read-write performance and the data reliability of the solid state disk are achieved finally.

Description

technical field [0001] The invention belongs to the storage field of solid-state hard disks, and more specifically relates to a method for processing user write requests of solid-state hard disks adapting to differences in flash memory pages. Background technique [0002] Solid-state drives (SSDs) use flash memory chips as storage media, and achieve high read and write throughput by accessing multiple flash memory chips in parallel within the disk. In addition, compared with traditional disks, SSDs do not require physical seeks when accessing data, greatly reducing data access latency. Based on these two advantages, solid-state drives have gradually replaced traditional disks as the mainstream storage devices in computer systems. However, with the gradual popularization of multi-level flash memory with high storage density in SSDs, the advantages of high throughput and low response latency of SSDs began to be lost. In addition, solid-state drives using multi-level flash me...

AI Technical Summary

Problems solved by technology

[0005] Aiming at the defects of the prior art, the purpose of the present invention is to solve the technical problems of slow performance and low reliability caused by the write request of the prior art regardless of the type of the flash memory page

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