Method and device for implementing snapshot of virtual disk

Abstract

The invention discloses a method and a device for implementing a snapshot of a virtual disk. The method comprises steps as follows: the virtual disk is subjected to snapshooting, and the snapshot contains data obtained by copying metadata of the virtual disk at the current moment; when write operation is required to be operated, data corresponding to the write operation is written into a new data block of the virtual disk, and an index position of the new data block is added to the metadata of the virtual disk; when modifying operation is required to be executed and a to-be-modified data block corresponding to the modifying operation is not modified after snapshooting, data corresponding to the modifying operation is redirected to the new data block of the virtual disk, and an index position of the to-be-modified data block in the metadata of the virtual disk is changed into the index position of the new data block. Therefore, normal realization of a snapshooting function is guaranteed, and meanwhile, read-write operation of related data can be realized only through one-time I / O (input / output) request by the aid of the metadata of the virtual disk, and the I / O performance of a virtual machine is greatly improved.

Description

technical field [0001] The present invention relates to the technical field of server virtualization, and more specifically, to a method and device for realizing a virtual disk snapshot. Background technique [0002] Virtualization is the cornerstone of cloud computing. Virtualization technology can make full use of hardware resources and can also isolate the dependencies between hardware architecture and software systems, improve system security performance, and increase the utilization of computing resources. [0003] With the development of virtualization technology and in-depth research on virtual machines replacing physical and physical machines, it has become a trend to become the operating environment of various businesses in enterprises. The virtual disk snapshot function is to save the data status of the virtual disk at a certain moment for the virtual machine. It can be used as a virtual disk backup, template, clone, etc., and has been widely used in many fields su...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a virtual disk snapshot implementation method and device to solve the problem of poor virtual machine I / O performance in the technical solutions for implementing the virtual disk snapshot function in the prior art

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