Fault tolerance mechanism employed in the cloud is state of the art problem to ensure reliability of cloud. The proposed work increases reliability of cloud by using swarm optimization based vm allocation policy. Sole PSO approach also selects optimal virtual machine for load allocation but once virtual machine has been selected than that vm is maintained within vm list at top place. Although vm resources may be less due to allocation hence starvation could be the problem. This problem is rectified using dynamic VM selection policy in which number of vm to be selected is reduced as vm at every phase is changed and hence less migration and downtime is obtained. In addition execution time and energy consumed is also affected by dynamic PSO approach.

Fault Tolerance, PSO, Consolidation, Energy Efficient

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