vMotion migration enables live migration of a virtual machines from one physical server (ESXi server) to another while maintaining continuous service availability. Additionally, vMotion allows you to perform maintenance on a host machine without the need for downtime on your virtual machine.
A virtual machine must meet the following requirements before migration:
•A virtual machine must not have a connection to a virtual device (CD-ROM or floppy drive) with a local image mounted. You can place your ISO images into a shared data store.
•A virtual machine must not have a connection to an internal vSwitch.
•A virtual machine must not have CPU affinity configured.
•Shared storage where the VM can store their files.
•A Gigabit Ethernet or faster connection for vMotion.
•Access to the same physical networks (hosts must be plugged into the same physical network).
•Hosts must have compatible CPUs. If you do not perform live migration between hosts with identical CPUs, you could experience a vMotion crash.
•A VMkernel port on each host (with a different IP address for each host).