Disk defragmentation method, disk defragmentation device and host

Abstract

The embodiment of the invention provides a disk defragmentation method, a disk defragmentation device and a host. The method comprises the following steps: judging the fragmentation degree of a first disk area according to a first space management object; if determining that the fragmentation degree of the first disk area reaches the preset fragmentation degree, writing a data block of each object corresponding to a defragmentation sub-area into a continuous disk space according to the first space management object, and writing metadata, which is generated when the data block of each object is written in the continuous disk space, in the continuous space, wherein the defragmentation sub-area is smaller or equal to the first disk area; and releasing the defragmentation sub-area. Visibly, a section of continuous idle space in the first disk area can be obtained after the defragmentation sub-area is subjected to disk defragmentation according to space management information; and thus, the disk defragmentation efficiency is increased.

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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