1. A computer-implemented method executed by one or more computing devices for preventing Service Level Agreement (SLA) violation during migration of a virtual machine to a virtualized physical server, the method comprising: determining, by at least one of the one or more computing devices, a capacity factor for a host and a target physical machine in the virtual environment, wherein the capacity factor is a ratio of a host physical machine capacity and a target physical machine capacity; computing, by at least one of the one or more computing devices, a change in a service rate in the target physical machine compared to a service rate in the host physical machine based on the capacity factor; determining, by at least one of the one or more computing devices, a virtual machine utilization and a response time in the target physical machine based on the service rate change and an arrival rate of one or more jobs; checking, by at least one of the one or more computing devices, if the virtual machine utilization and the response time in the target physical machine are within a predefined virtual machine utilization threshold and a response time threshold; checking, by at least one of the one or more computing devices, if the virtual machine migration in the target physical machine is violating a predefined target physical machine utilization threshold; and migrating, by at least one of the one or more computing devices, the virtual machine to the target physical machine if the predefined virtual machine utilization threshold, the response time threshold and the target physical machine utilization threshold are not violated.