A number of specific virtual machine configurations can prevent migration of a virtual machine with VMotion.

The following virtual machine configurations can prevent migration with VMotion:

You cannot use migration with VMotion to migrate virtual machines using raw disks for clustering purposes.

You cannot use migration with VMotion to migrate a virtual machine that uses a virtual device backed by a device that is not accessible on the destination host. (For example, you cannot migrate a virtual machine with a CD drive backed by the physical CD drive on the source host.) Disconnect these devices before migrating the virtual machine.

You cannot use migration with VMotion to migrate a virtual machine that uses a virtual device backed by a device on the client computer. Disconnect these devices before migrating the virtual machine.