Dynamic migration method and device for virtual machines

Abstract

The invention discloses a dynamic migration method and device for virtual machines. The method comprises the following steps of: calculating a vCPU migration weight of a source virtual machine according to a preset rule according to an available CPU resource; unbinding a physical CPU of the source virtual machine and setting a vCPU weight of the source virtual machine according to the vCPU migration weight; starting a corresponding target virtual machine at a target host according to state information of the source virtual machine and a migration requirement, and carrying out dynamic migration and network switching on data of the source virtual machine; and relieving the setting of a vCPU weight of the target virtual machine and binding a physical CPU of the target virtual machine. According to the method and device disclosed by the invention, vCPU weight enhancement can be carried out according to the calculated vCPU migration weight after the physical CPU of the source virtual machine is unbound, so that the dynamic migration from the source virtual machine to the target virtual machine is realized, and the using and performance of the source virtual machine and applications borne by the source virtual machine are not influenced in the dynamic migration process of the source virtual machine.

Description

technical field [0001] The invention relates to the technical field of computer virtualization, in particular to a virtual machine dynamic migration method and device. Background technique [0002] With the continuous development of computer virtualization technology, CPU (processor) virtualization, as an important part of virtualization technology, also puts forward higher requirements on the performance of vCPU (virtual processor) of a virtual machine. For virtual machines with high computing power requirements (such as database servers, etc.), we can increase the number of vCPUs, increase the weight of vCPUs, and bind physical CPUs to allow virtual machines to obtain higher performance. As one of the most effective means of improving performance, binding physical CPUs avoids frequent switching of processes between CPUs. At the same time, because the CPUs do not share caches, there is no problem of releasing the caches of old CPUs, thus The cache hit rate is greatly incre...

AI Technical Summary

Problems solved by technology

When the hardware needs to be maintained, the running services need to be migrated to other hardware platforms to run, and this process cannot affect the application services hosted by the virtual machine

[0004] Although the CPU binding method of the virtual machine can greatly improve the performance of the vCPU, the virtual machine cannot be dynamically migrated.

Because when the virtual machine is dynamically migrated, the host has changed, and the bound physical CPU has naturally changed, so the original binding policy will not take effect.

However, because the physical CPU binding of the migrated virtual machine is released, the performance will naturally decrease, which also has a certain impact on the applications carried by the virtual machine.

[0005] In the prior art, there is no other better solution to the problem of virtual machine migration after physical CPU binding except manual reconfiguration by the user (administrator), which is not conducive to user experience

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