Method of quickly responding to trim command, SSD (Solid State Disk) controller and system

Abstract

The invention provides a method of quickly responding to a trim command, an SSD (Solid State Disk) controller and a system. The method comprises the following steps: when the SSD controller receives the trim command issued by a host computer, the SSD controller acquires a logical address range signified by the trim command; the SSD controller modifies a state of a logical address signified by the trim command, and the state is set to be invalid; the SSD controller returns an answering signal meaning the trim command to be finished to the host computer; and after the trim command finishes the answering, the SSD controller selects a computer to modify a state of a physical address corresponding to the logical address, and the state is set to be invalid. According to the technical scheme provided by the invention, trim commands of multiple continuous large sections of data can be quickly executed, so that trim requests of the multiple large sections of data of the host computer are responded in a shorter period, the waiting time of a system is reduced and the command response efficiency is improved.

Description

technical field [0001] The present invention relates to the technical field of storage, and in particular to a method for quickly responding to a trim command, a corresponding SSD controller and an SSD system for quickly responding to a trim command. Background technique [0002] Solid State Disk (SSD) uses non-volatile memory chips as storage media. Physically, these memory chips must be erased before data can be written. Before erasing, it is necessary to transfer the original valid data on the memory block of the memory chip to another erased block, and this process is generally called garbage collection. The efficiency of garbage collection directly affects the write performance of the SSD. The higher the garbage collection efficiency is, the smaller the impact on the write performance of the host writing data to the SSD. Garbage collection is most efficient when all the data on a block is invalid. [0003] For this reason, the ATA (Advanced Technology Attachment, Adva...

AI Technical Summary

Problems solved by technology

The main operation of the SSD controller is to modify the table entries corresponding to the relevant data, including the data state table based on the logical address index and the physical state table based on the physical address. When the area of ​​TRIM is large, the number of table entry modifications and The time increases linearly, which will affect the response time of the command and make the command complete timeout; even if the cache technology is used in the SSD controller, the table entry is cached in it, and only the data in the cache is updated when the table entry is modified, which can be achieved to a certain extent. improve the command completion time, but still cannot fundamentally solve the above problems

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