Efficient virtual machines placement in physical machines for cloud computing environments

Cloud computing delivers the computing services over the internet. Cloud services help individuals and organization to use data that are managed by third parties or another person at remote locations. Migration of a virtual machine is simply moving the VM running on a physical machine (source node) to another physical machine (host node). The virtualization gives the power of partitioning the physical host in to multiple virtual machines. We can manage the number of active host and their power consumption by migrating the virtual machines according to their resource requirement and current status on that particular host. In migration process the processor state, storage, memory and network connection are moved. It is widely used in IT organizations to offer efficient online maintenance, fault tolerance, reconfiguration and load balancing. Two important performance metrics are downtime and total migration time that the users care about most, because these metrics deals with service degradation and the time during which the service is unavailable. In general migration improve resource utilization and communication locality, mitigate performance hotspots, achieve fault tolerance, reduce energy consumption, and facilitate system maintenance activities. in this paper we try to improve energy consumption by selecting better hosts for VM machines during migration.