Method, device and system for whole system online migration of virtual machine

Abstract

The embodiment of the invention discloses a virtual machine total-system online migration method, device and system. The virtual machine total-system online migration method includes the steps of pre-migrating external storage data of a virtual machine to an objective physical host computer, judging the relationship between newly-generated increment external storage data and internal storage data occupied by the virtual machine, if the difference obtained by subtracting the internal storage data from the increment external storage data exceeds an external storage pre-migration threshold value, transmitting the increment external storage data to the objective physical host computer until the difference obtained by subtracting the internal storage data from the increment external storage data is smaller than or equal to the external storage pre-migration threshold value, pre-migrating the internal storage data and the increment external storage data to the objective physical host computer, circularly pre-migrating the increment external storage data and increment internal storage data to the objective physical host computer until the increment internal storage data are smaller than an internal storage pre-migration threshold value, suspending the virtual machine, migrating all residual data to the objective physical host computer, and re-operating the virtual machine on the objective physical host computer. According to the virtual machine total-system online migration method, device and system, the suspending time of the virtual machine is remarkably shortened.

Description

technical field [0001] The present invention relates to the technical field of computer science virtualization, and in particular, relates to a method, device and system for online migration of a whole system of a virtual machine. Background technique [0002] Virtual machine migration generally refers to migrating a virtual machine running on one host, for example, a source host, to another host, for example, running on a target host. In order to achieve this goal, it is necessary to transfer the running state of the virtual machine from the source host to the target host, and then resume the running of the virtual machine on the target host. Online migration means that during the entire migration process, the pause time of the virtual machine is very short, and the services running on the virtual machine can always respond to user requests. This kind of migration is also called hot migration. [0003] At present, virtual machine migration is usually limited to the local a...

AI Technical Summary

Problems solved by technology

[0009] (1) Although VMware's vsphere product supports online virtual machine migration (vMotion) and online storage migration respectively, the simple combination of the two migration mechanisms will cause two shutdowns of the virtual machine, that is, there is one shutdown during the migration of the virtual machine. There is another downtime during the storage migration, which will have a greater impact on the services on the virtual machine

In addition, because the CPU of the virtual machine has high requirements on the access latency of the disk where the operating system resides, especially in a cross-domain environment, whether the virtual machine can perform online storage migration is also restricted by the network environment, which may also cause system-wide migration. unable to proceed

[0010] (2) Although the block migration technology of KVM realizes the online whole-system migration of the virtual machine, after the migration of the virtual machine disk image is completed, the migration of disk incremental data, virtual machine system memory and CPU status after the shutdown takes longer. outage time, at a discount on migration performance

[0011] (3) Although the system-wide migration method proposed by Zhang Binbin of Peking University and others in the article "Online Migration of Virtual Machine Whole System" has made great improvements in the recovery of virtual machines, it has effectively reduced the downtime during the migration process. It can show better performance when the external memory data is much larger than the internal memory data, but it still does not provide a suitable solution to the delay problem caused by the transmission method in KVM, and, because this method is a side-start While the virtual machine is running on the destination physical machine, data is migrated from the source physical host, causing the data of some services to exist in both the source physical host and the target physical host, thus causing a delay in the response to some services

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