Disk defragmentation method, device and host

Abstract

Embodiments of the present invention provide a disk defragmentation method, device, and host. The method includes: judging the degree of fragmentation of the first disk area according to the first space management object; if it is determined that the degree of fragmentation of the first disk area reaches If the degree of fragmentation is preset, write the data blocks of each object corresponding to the defragmentation sub-area into continuous disk space according to the first space management object, and write the data blocks of each object into continuous disk space The metadata generated during the space is written into the continuous space; wherein, the defragmentation sub-area is less than or equal to the first disk area; the defragmentation sub-area is released; it can be seen that the fragmentation is performed according to the space management information A section of continuous free space in the first disk area can be obtained after defragmenting the sub-area, which improves the efficiency of defragmenting the disk.

Description

technical field [0001] Embodiments of the present invention relate to computer technology, and in particular to a disk defragmentation method, device and host. Background technique [0002] As the disk capacity increases, the file system takes longer and longer, and the fragmented space on the disk becomes more and more. For mechanical disks, sequential read and write can give full play to its performance, but more and more disk fragments bring more and more discrete IO, causing the head to jump back and forth, resulting in a sharp decline in read and write performance. [0003] Figure 1A It is a schematic diagram of the existing disk defragmentation method, Figure 1B for the physical view of the object before defragmentation, Figure 1C A physical view of an object after defragmentation for an existing disk. In the prior art, disk defragmentation is performed in the following manner: 1) judging whether the number of continuous data blocks included in a certain source f...

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Problems solved by technology

[0004] In the prior art, during the disk space allocation process, there may be data blocks of other files between the discrete data blocks of the source file, such as Figure 1B As shown, blk1, blk7, blk9, blk11 and blk13 are data blocks of other files; according to the existing disk defragmentation method (disk defragmentation is carried out to the data blocks of a single file) Figure 1C As shown, it can be seen that there is still a lot of disk fragmentation on the disk

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