Data down-refreshing method and related device

Abstract

The invention relates to data storage, and discloses a data down-refreshing method and a related device, and the method comprises: a storage device comprises an SSD and a disk, the SSD is used as a cache of the disk, the method comprises the steps that when a data down-refreshing instruction is received, the storage device obtains M dirty data cache groups from a dirty data cache linked list in the SSD, and M is a positive integer; The storage device obtains N dirty data cache blocks from one or more of the M dirty data cache groups, and N is a positive integer; The storage device determines Nlogic block addresses corresponding to the N dirty data cache blocks; And the storage device writes the N dirty data cache blocks into the disk according to the sequence of the N logical block addresses from small to large. By implementing the embodiment of the invention, repeated stepping and back-and-forth track finding of the disk are reduced, the service life of the disk is prolonged, and thedown-refreshing efficiency is improved.

Description

technical field [0001] The present invention relates to the field of computer technology, in particular to a data downloading method and a related device. Background technique [0002] In recent years, the development of hard disk has been rapidly improved in the continuous technological progress, from capacity and speed to interface. As people's demand for data increases, the bottleneck of the storage system becomes more and more obvious. In harsh environments such as embedded mobile devices and industrial automation control, the mechanical structure of traditional hard drives can no longer meet the requirements, and all this has changed with the arrival of solid-state drives (SSD). Nowadays, more and more storage systems begin to use SSDs as high-speed cache memory (cache) media. [0003] In a general SSD storage device, after the data is written to the SSD, if a transaction is accessing the data and modifying the data, but this modification has not been submitted to the...

AI Technical Summary

Problems solved by technology

[0004] When dirty data is flushed, it is usually written to the mechanical hard disk one by one according to the order in a cache group. Since many cache blocks in the cache group are random, that is, the disk LBA (logical block number) mapped by many cache blocks is random Yes, and the mechanical hard disk is very slow in handling random IO. Therefore, this method of flushing dirty data requires the disk to repeatedly step the head and seek back and forth, which reduces the service life of the disk and the efficiency of flushing is low.

Images