Address mapping method and device based on large-capacity solid storage

Abstract

The invention provides an address mapping method based on large-capacity solid storage. The method is characterized by including the steps of obtaining a writing command for writing data in a solid hard disk, wherein the writing command carries data to be written and logic block addresses of the data to be written; inquiring about a third-stage mapping table, corresponding to the logic block addresses, in a main memorizer according to a global second-stage mapping table; if the third-stage logic list corresponding to the logic block addresses does not exist in the main memorizer, indexing the third-stage mapping table in the solid hard disk according to the global second-stage mapping table, reading out the third-stage mapping table, corresponding to the logic block addresses, in the solid hard disk and storing the third-stage mapping table into the main memorizer; controlling a solid hard disk controller to allocate physical page numbers for the logic block addresses, storing the physical page numbers in the third-stage mapping table, corresponding to the logic block addresses, in the main memorizer, and writing the data to be written in the physical page numbers.

Description

technical field [0001] The present invention relates to the technical field of electronic communication, in particular to an address mapping method and device based on large-capacity solid-state storage. Background technique [0002] Commonly used data carriers in the storage field are mechanical hard drives and solid-state drives (SSD). Solid-state drives have the characteristics of small size, low energy consumption, strong anti-interference ability, extremely small addressing time, and high number of read and write operations per second (IOPS). , Compared with traditional disks, flash and other solid-state hard disk storage can achieve microsecond-level delays, while traditional disks can intelligently achieve millisecond-level delays. However, due to flash and other solid-state hard disk itself (1) the modified data cannot be directly rewritten on the original data, resulting in non-fixed-point update; (2) the basic unit of data reading and writing is a page, and the bas...

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Problems solved by technology

[0006] The embodiment of the present invention provides an address mapping method and device based on large-capacity solid-state storage. According to the logical block address of the data to be read or written, the address corresponding to the logical block address is searched in the two-level mapping table. 3-level mapping table, a multi-level sequential mapping scheme for reading the data from the 3-level mapping table or writing the data in the physical page number allocated for the logical block address, since the 2-level mapping Only the index of the 3-level mapping table is stored in the table, and only when the 3-level mapping table in the main memory does

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