A virtual machine data copy method and a virtual machine data copy system

Abstract

The invention discloses a virtual machine data copying method and a virtual machine data copying system, which are used to reduce the amount of copied data when performing virtual machine cloning and backup, and can save copying time and storage space for target storage. The method in the embodiment of the present invention includes: receiving the NBD instruction, obtaining the virtual NBD block device mirrored by the source virtual machine according to the NBD instruction; receiving the partition instruction, obtaining the data amount and partition information of the virtual NBD block device according to the partition instruction; according to the data amount and partition information Obtain the target disk image bitmap information. The target disk image bitmap information includes valid bits and invalid bits. The partition of the virtual NBD block device corresponding to the valid bit contains valid data, and the partition of the virtual NBD block device corresponding to the invalid bit contains invalid data. ; Copy the data of the partition of the virtual NBD block device corresponding to the effective bit in the image bitmap information of the target disk to obtain the copy file of the source virtual machine image.

Description

Technical field [0001] The present invention relates to the field of virtualization techniques, and more particularly to a virtual machine data copy method and a virtual machine data copy system. Background technique [0002] Virtual machine clones and backups are two common basic functions provided by virtual platforms, saved for data backups and redundant copies for virtual machines. [0003] Virtual Machine Cloning: Under the virtualization scene, copy a virtual machine to a completely exactly the same virtual machine, and the content is exactly the same, and the mirroring and configuration of both are independent. [0004] Virtual Machine Backup: In the virtualized scene, to copy the data or mirror of the virtual machine to a large-capacity storage device such as a peripheral storage or tape in the virtualization scenario, to deal with files, data loss or damage. [0005] The currently common method is to implement by copying the virtual machine mirror file, the amount of dat...

AI Technical Summary

Problems solved by technology

[0006] From the above method 1 and method 2, it can be known that when performing virtual machine cloning and backup, the copied data is not copied according to the size of the actual effective data contained in the image, but is copied according to the actual physical disk space occupied by the image, resulting in In the process of copying, there are many copies of invalid data, resulting in waste of storage space and copying time

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