虚拟机磁盘迁移技术研究与实现

已有基于内存的虚拟机迁移技术要求迁移源机和目标机之间必须共享网络磁盘,迁移性能受网络条件的影响很大,且在不支持"共享网络磁盘"的环境中,无法实现虚拟机迁移.针对上述问题,考虑到虚拟机磁盘作为虚拟机运行所需的持久化状态的封装体,所展现出的如高可用性、高效能、安全稳定等良好特性,提出基于磁盘的虚拟机迁移.通过设计虚拟磁盘驱动系统DiskMig,在实现虚拟机磁盘迁移的同时保证了其在源端和目的端的一致性.设计了"Transfer on Demand with Forward-ahead"(TOD&FA)算法快速同步源端和目的端磁盘文件差异.DiskMig采用自行设计的高效存储结构bitmap,使记录、查询虚拟机磁盘迁移过程中的大量I/O操作时仅需时间复杂度O(1).实验表明,DiskMig所采用的相关方法对虚拟机及其中应用程序运行性能的影响仅为5%左右,有效支持了虚拟机磁盘文件的迁移.

Research and Implementation on Migration of Virtual Machine Including Vm-disk

The existing memory-based virtual machine(VM) migration technology requires network-disk shared between source side and destination side,which results performance degradation greatly from poor network quality,and the VM migration can not be implemented without shared network-disk environment.To solve these problems,in view of the high-availability,high-performance,security and stability displayed by VM-disk,which acts as the encapsulation of VM persistent running state,a new migration strategy based on VM d...