关键词: 实时迁移, 后拷贝, 预拷贝, 服务活跃度, 脏页率, 停止条件

Abstract: The live migration of virtual machine is the migration between the different physical hosts, at the same time, ensuring the normal operations of the virtual machine service. In order to ensure the migration efficiency and the normal operation, it needs to reduce the total migration time and downtime. Post-copy and Pre-copy are both frequently used to live migration, Post-copy can reduce the total migration time, Pre-copy can reduce the downtime. This paper presents an optimization Pre-copy scheme based on service live level. According to the relationship between service and dirty page rate, selecting the appropriate stop condition, it makes the live migration enter the stop and copy phase in an appropriate critical point. This not only reduces the number of iterations of the page, but also transmits fewer pages in the stop and copy phase, so as to achieve the purpose of reducing the total migration time and downtime at the same time.

Key words: live migration, Post-copy, Pre-copy, service live level, dirty page rate, stop condition