Does Live Migration of Virtual Machines Cost Energy?
Live migration, the process of moving a Virtual Machine (VM) interruption-free between physical hosts is a core concept in modern data centers. Power management strategies use live migration to consolidate services in a cluster environment and switch off underutilized machines to save power. However, most migration models do not consider the energy cost of migration. This paper experimentally investigates the power consumption and the duration of virtual machine migration. The authors use the KVM platform for their experiment and show that live migration entails an energy overhead and the size of this overhead varies with the size of the virtual machine and the available network bandwidth.