A method and device for reducing write latency under gc of solid-state hard disk

Abstract

The embodiment of the present invention discloses a method and device for reducing write latency in a solid-state hard disk under GC. The method includes separately counting the number of different data blocks, and the different data blocks include GC source blocks, GC destination blocks, and free blocks provided for LKM ; Perceive the write pressure and GC efficiency of HOST according to the number of different data blocks, and calculate the arbitration value; send the arbitration value to LKM, and LKM allocates data frame resources for GC writing according to the arbitration value. The invention senses the writing pressure of the HOST, measures the writing pressure and GC efficiency, and allocates appropriate data frame resources for the GC based on this, improves resource utilization, reduces writing latency, and improves product performance.

Description

technical field

[0001] The invention relates to the technical field of hard disk garbage collection, in particular to a method and device for lowering write latency of a solid-state hard disk GC (Garbage Collection, garbage collection). Background technique

[0002] The garbage collection of SSD (Solid State Drives, solid state drive) is actually equivalent to the defragmentation of solid state drives. It is an automatic processing mechanism of the main control chip of the solid state drive itself and does not depend on the operating system. Since the erasure of SSD solid-state disk is based on data blocks, garbage collection is also performed in units of data blocks, that is, all valid pages in a data block are merged into a new data block, and the old pages are merged into a new data block. Data blocks are erased. Garbage collection must not only ensure sufficient free data blocks for the host to write, but also minimize the occupation of SSD master control resources as m...

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