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Zero-copy defragmentation method for virtual file system fragments

A virtual file system, zero-copy technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve the problems of complex defragmentation process, affecting other VM performance, serious disk fragmentation, etc., to achieve the elimination of fragmentation, The effect of flexibility, ease of use, and low overhead

Inactive Publication Date: 2011-09-21
HUAZHONG UNIV OF SCI & TECH
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  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Since there are file management mechanisms at the VM (virtual machine) and VMM (virtual machine manager) layers, disk fragments will be generated on both physical disks and virtual disks, which results in so-called hierarchical fragmentation, which makes defragmentation difficult. process becomes more complicated
In addition, when multiple VMs share a disk at the same time, fragmentation can cause performance degradation for each VM, and defragmenting one VM is likely to seriously affect the performance of other VMs
Therefore, in a virtual environment, the problem of disk fragmentation becomes more serious and complex

Method used

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  • Zero-copy defragmentation method for virtual file system fragments
  • Zero-copy defragmentation method for virtual file system fragments
  • Zero-copy defragmentation method for virtual file system fragments

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Embodiment Construction

[0017] In the zero-copy defragmentation system of the virtual file system of the present invention, flexible and easy-to-use operations are realized by providing an interface for selecting and executing defragmentation for the Host administrator. This system mainly provides users with two functions, one is to analyze the virtual machine disk image and provide relevant information to the user; the other is to perform zero-copy defragmentation on the target virtual file system of the target virtual machine. figure 1 It is the overall architecture of the zero-copy defragmentation system for virtual file system fragmentation.

[0018] What is designed here is a virtual disk defragmentation system for the host administrator to use in a virtualized environment. The host administrator first needs to use the user interface to conveniently select the image of the virtual machine that he needs to obtain information or even defragment. . Then the system can obtain information about the ...

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Abstract

The invention discloses a zero-copy defragmentation method for virtual file system fragments. The defragmentation method is a zero-copy defragmentation method, that is, any data block on a physical disk is not required to be moved or copied, only the metadata mapping relation between a virtual file system and the corresponding physical file system is modified, and therefore the zero-copy defragmentation method has the characteristics of high efficiency and low cost. Compared with the traditional defragmentation method of a virtual machine, the zero-copy defragmentation method disclosed by theinvention has the characteristics of more effectiveness, higher efficiency, lower cost and flexibility in use.

Description

technical field [0001] The invention belongs to the field of computer virtualization, and in particular relates to a zero-copy sorting method for virtual file system fragments. Background technique [0002] Disk fragmentation has always been a major problem in computer systems, causing serious losses to the system's I / O performance. Disk fragmentation is unavoidable in computer systems as files are created, expanded, and deleted. This problem is particularly serious in the Windows system, because the file systems used in the Windows system, such as FAT and NTFS, especially FAT, are prone to serious fragmentation problems due to their own data storage mechanism. Although common file systems under Linux, such as the EXT file system, have clever pre-allocation mechanisms to reduce the generation of disk fragments, they still cannot avoid fragmentation. And disk fragmentation brings severe performance loss to the computer system, which is due to disk fragmentation causing the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G06F17/30
Inventor 金海廖小飞苏昱王萍圆
Owner HUAZHONG UNIV OF SCI & TECH
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