Method for realizing virtual machine disk image cross-storage live migration and virtual machine system

Abstract

The invention discloses a method for realizing virtual machine disk image cross-storage live migration and a virtual machine system and relates to the technical field of virtual machines. The method for realizing virtual machine disk image cross-storage live migration comprises the steps that an initial disk image is copied to a target storage area when a source side virtual machine operates, change, occurring during copying, of a source side disk image is recorded, and a corresponding I/O function digit image is generated; the source side virtual machine is stopped temporarily after copying of the initial disk image is completed, and the I/O function digit image is copied to the target storage area; a target side virtual machine is started, and the source side disk image is reserved and copied to the target storage area. According to the method for realizing virtual machine disk image cross-storage live migration and the virtual machine system, the change, occurring during the period when the source side disk image is copied to the target side from the source side, of the source side disk image is recorded through the I/O function digit image, repeated copying of the disk image is avoided, and the overall virtual machine migration time is shortened; meanwhile, the virtual machine on the target side can be started after copying of the disk image and the I/O function digit image is completed, and thus the operating time during which the virtual machine is switched to the target side from the source side is greatly shortened.

Description

technical field [0001] The invention relates to the technical field of virtual machines, in particular to a method for realizing hot migration of a virtual machine disk image across storage and a virtual machine system. Background technique [0002] The method for cross-storage live migration of virtual machine disk images, existing technologies include: [0003] Technology 1: The multi-round iterative method proposed by the Xen organization realizes the migration of the disk image of the virtual machine. The whole process has gone through N rounds of iterations. In the first round, the entire disk image is copied. In the remaining N-1 stages, the disk files that have changed during the previous round of transmission are transferred in each round until the set conditions are met, and then stop and synchronize. remaining disk files; Figure 1A The time axis of conventional thermomigration is shown. [0004] Technology 2: Online migration of virtual machine disk images in a ...

AI Technical Summary

Problems solved by technology

[0005] But all there is certain problem and drawback in prior art

[0006] The problem of technology 1: the migration of the disk image of the virtual machine using multiple rounds of iterations leads to a long migration time, occupying computing and bandwidth resources for a long time, especially when the virtual machine migration is completed in a wide area network environment, this impact will be more obvious

[0007] The problem of technology 2: the online migration of the virtual machine disk image in the WAN environment avoids multiple iterations of copying the disk image, but it is necessary to wait for the destination disk image to restore the changed data before starting the destination virtual machine, causing the virtual machine The time for switching from the source end to the destination end (downtime waiting time) is too long, which may affect the continuity of the business

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