Flash data management method and system

Abstract

The invention is adapted to the technical field of a solid-state storage technology, in particular to a flash data management method and a flash data management system. The flash data management method comprises the following steps of: managing address mapping, building a logic physical address mapping table mapped on the same physical page by a plurality of logic pages, setting the logic pages as index of the logic physical address mapping table, wherein each logic page corresponds to a physical page value, the physical page value comprises data segments of index values which respectively point to the actual physical page address and correspond to one of the logic pages, and arbitrary logic sequences between the plurality of logic pages in the physical page are relevant; and mapping the logic page to the physical page and updating the logic physical mapping table during writing data operation, or reading the logic physical address mapping table according to the logic pages during reading data operation, and indexing to the corresponding physical page. Therefore, the plurality of logic pages can be mapped to the same physical page according to the size of the physical page and the sizes of the logic pages, reduction of ready-modify-write (RMW) operation is facilitated, and the writing performance is improved.

Description

technical field [0001] The invention relates to the technical field of solid-state storage, in particular to a flash memory data management method and system. Background technique [0002] In the FTL (Flash Translation layer, Flash Translation Layer) of the existing solid-state hard disk, based on the page mapping technology, the physical page size of NAND FLASH (NAND flash memory) is used as the logical page size, that is, the physical page and the logical page are one by one. corresponding. Although the minimum operating unit of the host system is a logical block, its size is 512B, but the actual read and write files are often 4KB (determined by the file system), the physical page size of the previous NAND FLASH is not greater than 4KB, so there is no need to distinguish logical pages and physical pages. But at present, the physical page size of NAND FLASH is mainly 8KB / 16KB, or even larger. In this case, the physical page is still used as the logical page, and the rand...

AI Technical Summary

Problems solved by technology

[0003] In summary, the existing flash memory data management methods and systems obviously have inconveniences and defects in actual use, so it is necessary to improve them

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