VMware VMotion - license

VMware VMotion technology, unique to VMware, leverages the complete virtualization of servers, storage and networking to move an entire running virtual machine instantaneously from one server to another. The entire state of a virtual machine is encapsulated by a set of files stored on shared storage, and VMware's VMFS cluster file system allows both the source and the target ESX Server to access these virtual machine files concurrently. The active memory and precise execution state of a virtual machine can then be rapidly transmitted over a high-speed network. Since the network is also virtualized by ESX Server, the virtual machine retains its network identity and connections, ensuring a seamless migration process.