Live-migration of virtual machines (VMs) has become an indispensable management operation of cloud platforms. The cloud platforms need to migrate multiple co-located and live VMs from one physical node to another for power saving, load balancing and maintenance. Such live-migration operations are critical to the running services, and thus should be completed as fast as possible. State-of-the-art live-migration techniques optimize the migration performance of single or multiple VMs by concentrating on Virtual Machine Monitor (VMM), little attention has been given to the cloud platforms which control and schedule the multiple migration operations. In this paper, we consider the problem of scheduling migration operations to minimize the makespan.