Migrating virtual machines from Virtual Server 2005 R2 to Hyper-V involves migrating both the configuration of the host and the virtual machines themselves. In this chapter, we discussed what you need to consider prior to migrating the host and the virtual machines. A key decision you must make before migrating the host involves determining if there are any virtual machines using operating systems that are not supported on Hyper-V, in which case you should maintain a Virtual Server host.
The chapter provided you with the important considerations and the steps for preparing the virtual machine hard disk for migration. These included dealing with hardware differences (SCSI controllers, network adapters, and HAL), cleaning up the virtual hard disk (Undo, saved state, and differencing disks), and removing Virtual Machine Additions. After the host is migrated, you learned that you can create a new virtual machine using the existing virtual hard disk, and then you must install Integration Services to provide support for synthetic devices and improve performance.