Method and system of achieving data copying of solid-state hard disk FTL and solid-state hard disk

Abstract

The invention discloses a method and system of achieving data copying of solid-state hard disk FTL and a solid-state hard disk. The method comprises the steps of maintaining an address mapping list from a logical address LA to a physical address PA; maintaining an array or linked list of the physical address PAdest which becomes a destination of a copy, forming a reverse address mapping list from the mapping of the physical address PAdest to multiple logical address LAi, and maintaining the reverse address mapping list; receiving a copy-free copy command sent by a software to the solid-state hard disk, wherein the copy-free copy command includes a source logical address LAsrc of the copy, a destination logical address LAdest, and the number of data blocks which need to be copied; modifying the address mapping list and the reverse address mapping list based on a copy-free command, directing the destination logical address LAdest to the physical address to which the source logical address LAsrc is mapped, and completing the copy-free copying of the data. According to the method and system of achieving the data copying of solid-state hard disk FTL, unnecessary writing operations in the solid-state hard disk can be greatly reduced, the copying time is reduced, the service life of the solid-state hard disk is prolonged, and data reliability is improved.

Description

technical field [0001] The invention relates to the technical field of solid-state hard disks, in particular to a method, a system and a solid-state hard disk for realizing data copying in the FTL of the solid-state hard disk. Background technique [0002] The FTL (Flash translation layer) of solid state drives (Solid State Drives, SSD) is the design core of solid state drives. The current FTL in solid state drives does not support the implementation of internal data copy commands, let alone zero data copy. It only directly supports basic commands such as READ, WRITE, and TRIM. Correspondingly, it only implements basic functions such as address mapping, garbage collection, data reading and writing, and wear balance. [0003] Existing solid-state drives cannot meet the data replication requirements of existing applications and system programs, and require the CPU and memory on the host to participate in the physical copying of data, including the actual reading from and writi...

AI Technical Summary

Problems solved by technology

[0003] Existing solid-state drives cannot meet the data replication requirements of existing applications and system programs, and require the CPU and memory on the host to participate in the physical copying of data, including the actual reading from and writing to the solid-state drive

However, there are two disadvantages in this approach: (1) Physical data replication leads to a long copy time, wasting the read and write bandwidth of the SSD and the time of the CPU; (2) In order to ensure data persistence and consistency, After the write operation, it is often necessary to send the FLUSH command to the solid state drive, but the FLUSH command is time-consuming, which will reduce the performance of the solid state drive, and the write operation to the solid state drive will shorten the life of the solid state drive

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