A review on migration techniques and challenges in live virtual machine migration

Cloud computing is an internet based that provides shared resources on demand and manage them like networks, storage, servers, applications and services which requires optimum effort of management. Migration of virtual machine is gaining more importance today to improve utilization of resources, load balancing of processing nodes, isolation of applications, tolerating the faults in virtual machines, to increase the portability of nodes and to rise the efficiency of the physical server. VM migration is the most important feature of virtualization. With this feature an OS state is transferred from one computing node to another physical node. There are two different techniques of migration, first is pre-copy migration and the second is post-copy migration technique. The pre-copy approach transfers the memory prior to the transfers of the execution to destination node. On other side the post copy migration first transfers the execution and then transfers the memory. This paper provides the better understanding of virtual machine migration techniques and research challenges by comparing existing VM migration techniques of cloud computing.