Cloud computing is a potent field with an on-demand resource provisioning and “Pay Per Use” facility to the customers. Virtualization is the most centered technology used in cloud computing. The virtual machine live migration is an important feature of virtualization which provides virtual machine migration from one host to another host when the services are still running. It provides fault tolerance, load balancing, power saving in data centers. The most efficient technique will have least total migration time and downtime. With an increasing data, we need data centers to store and process it, which leads to huge environmental destruction. Introduction of Virtual machines steps towards Green Computing. Virtual machine migration is of high importance for the uninterrupted and high-quality services. This paper reviews` various techniques for virtual machine migration with their merits and demerits.

Virtualization, Virtual Machines, Live Migration, Downtime, Total Migration Time

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