Providing a Solution to Improve Pre-Copy Method for Migrating Virtual Machines in Cloud Infrastructure

Cloud computing can be defined as a new computing model which suggests solutions for providing information technology services analogous to utility services such as power electricity, telephone. Thanks to the virtualization technology, most of Cloud datacenters use this technology for performance improvement. This technology transforms a physical server to several virtual machines. With regard to this property, virtual machines can be transferred from one place to another place that is called migration. Pre-Copy is one of the main methods in migration techniques. An important problem in this method is that when the memory pages are changed (dirty pages) faster than sending pages to a destination, the process of migration will take a long time that is the case in transferring virtual machines. In this paper, a solution is proposed that sets up the speed of virtual machines in terms of CPU frequency and makes a balance between senders and receivers in pre-copy algorithm. The results show that the proposed method has better performance compared to the pre-copy method and decreases the total migration time around 25% and the total amount of transferred data around 47%.