Trim command implementation method and device based on solid state disk and computer device

Abstract

The invention relates to a Trim command implementation method and device based on a solid state disk, a computer device and a storage medium. The method comprises: acquiring a Trim command implementation request based on the solid state disk; requesting to analyze the logic address of the Trim command according to the Trim command of the solid state disk; splitting the logic address into an immediate execution part and a background execution part according to an analysis result; and executing synchronous Trim operation on the Trim command corresponding to the immediate execution part, markingthe Trim command corresponding to the background execution part in a Trim bitmap table, and writing the Trim command into the NAND. According to the method, the content of the Trim command is split into an immediately executed part and a background executed part. The immediately executed part is subjected to normal Trim operation, and the background executed part is marked and written into the NAND and is taken out when the NAND is idle, so that the completion time of the Trim command is shortened, and the SSD has better user experience.

Description

technical field [0001] The present invention relates to the technical field of solid-state hard drives, in particular to a method, device, computer equipment and storage medium for implementing a Trim command based on solid-state hard drives. Background technique [0002] At present, SSD (Solid State Drive) has been widely used in various occasions, and is gradually replacing traditional hard disks due to its excellent performance, power consumption, and environmental adaptability. In the solid-state hard disk, when the user deletes the file, it just cuts off the association between the file and the operating system, but the SSD still retains the mapping between the logical address and the physical address, and the data in the NAND (for the deleted file) is also considered valid by the SSD. FTL performs garbage collection operations, and these data will still be transported; for this reason, Nvme provides the Trim command, and the logical address that has been trimmed will b...

AI Technical Summary

Problems solved by technology

In the solid-state hard disk, when the user deletes the file, it just cuts off the association between the file and the operating system, but the SSD still retains the mapping between the logical address and the physical address, and the data in the NAND (for the deleted file) is also considered valid by the SSD. FTL performs garbage collection operations, and these data will still be transported; for this reason, Nvme provides the Trim command, and the logical address that has been trimmed will be used as nomapping data or return the previously written data when it is read again. The data corresponding to the passed logical address will not be regarded as valid data when FTL performs garbage collection; when formatting a disk or deleting a large file, the host will send a Trim command to the SSD with a relatively large space. For the logical address of the segment space, the firmware needs to modify the corresponding "logical to physical address mapping table" to be invalid, and modify the corresponding number of valid pages. This operation often takes several seconds to more than ten seconds. Obviously, this delay affects the user experience. If there is an abnormal power failure during this process, the unfinished operation will not be resumed

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