Method and device for reducing SSD write amplification, and computer equipment

Abstract

The invention relates to a method and a device for reducing SSD write amplification, and computer equipment. The method comprises the steps of setting a plurality of write points; classifying data atthe tail of a link table of a cache; and writing the classified data into different write points. According to the method, the plurality of the writing points are set; the cold data in the cache is more finely classified according to the popularity, thereby acquiring multiple types of cold data; the data with the similar popularity is written into a flash block corresponding to the same write point; and the mode of writing the cold data in the cache into a flash is optimized, so that the triggering of garbage recovery is reduced, the write amplification is effectively reduced, and the servicelife of the flash is prolonged.

Description

technical field [0001] The invention relates to a write operation processing method of a solid-state hard disk, and more specifically refers to a method, device and computer equipment for reducing SSD write amplification. Background technique [0002] In a solid-state drive (i.e., SSD), the data initiated by the host is first cached in the DRAM, and the management strategy of the DRAM needs to ensure data consistency, that is, if the subsequent host sends data with the same logical address (i.e., LBA) to the DRAM, The data finally written to the storage medium (the mainstream medium is Nand Flash) must be the data sent by the host last time; if the host sends the data of the same LBA to the DRAM multiple times and then issues a command to read the LBA, then the SSD returns to the host The data must also be the last written data. [0003] In data centers and enterprise-level application scenarios, the host will frequently send some active LBAs, that is, some LBAs will be fre...

AI Technical Summary

Problems solved by technology

However, this technology uniformly treats the data at the end of the cache linked list as cold data and writes them to the flash memory block, which is not refined enough, such as Figure 8 As shown, if there is a large gap between the coldness and hotness of these data, for example, the data written by the host can be divided into five levels according to the level of coldness and heat. The higher the level, the hotter the data, then the existing technology can only handle the hottest N level. data, the remaining 5-N files are written into the same flash memory block, such as Figure 8 , then the flash memory block is more likely to have some invalid pages, that is, the garbage collection mechanism is still relatively easy to trigger, and there is still the problem of write amplification

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