Method and device for restoring virtual machine

Abstract

The invention relates to a method and a device for restoring a virtual machine. The method comprises the following steps of: receiving an incremental data comparing command sent by a backup server by a virtual platform, wherein the incremental data comparing command contains first changing identification information; carrying out snapshot operation on the virtual machine at the current moment according to the incremental data comparing command to obtain second changing identification information; determining a changing data block with data content which is changed in a magnetic disc of the virtual machine according to the first changing identification information and the second changing identification information; and sending block identification information of the changing data block to the backup server to obtain backup data of the changing data block at a moment to be restored by the backup server. The backup server sends the inquired backup data of the changing data block at the moment to be restored to the virtual platform and the virtual platform can restore the content of the changing data block to the moment to be restored. According to the embodiment, the virtual machine can be rapidly restored and the loss of a hard disc is reduced.

Description

Technical field [0001] The invention relates to the technical field of virtual machines, in particular to a method and device for restoring virtual machines. Background technique [0002] Virtualization usually means that the computer operating system and programs run on virtual hardware instead of real hardware. Computer virtualization is to virtualize a very virtual computer on a computer through a software platform method. The virtualized computer is called a virtual host or virtual machine. The software platform that the computer runs is a virtualization platform. The virtualization platform can provide an Application Programming Interface (API) for reading and writing virtual disks of the virtual machine. The backup system can perform operations on the virtual machine through this interface. Backup and restore. [0003] In the prior art, the incremental backup of the virtual machine can be implemented through the Changed Block Tracking (CBT) function of the virtualization pl...

AI Technical Summary

Problems solved by technology

The restoration method of the existing virtual machine needs to delete the virtual machine to be restored and rebuild the disk files of the virtual machine to be restored, thus occupying a large amount of system resources; and writing all the disk files back into the virtual disk from the backup server increases the Additional disk input / output operations, which in turn aggravate the wear and tear of the hard disk; the restoration time required for the entire restoration process is very long, increasing the time cost

Images