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Physical or virtual guest to Hyper-V requirements

In addition to the core Double-Take Availability requirements, use these requirements for physical or virtual guest to Hyper-V protection.

Source server—The source server can be any physical or virtual server running any of the operating systems listed in the core Double-Take Availability requirements. However, if you are using a Windows 2003 operating system, you must have Service Pack 2 which is required for Hyper-V Integration Services. Additionally, if your source is a virtual server and you want Double-Take Availability to monitor it for failover, then you must have Integration Components installed on the guest operating system and the virtual machine must be powered on.
Target server—The target server can be any Windows 2008 or 2008 R2 operating system from the core Double-Take Availability requirements that has the Hyper-V role enabled. In addition, you can use Hyper-V Server 2008 R2 or Server Core 2008 R2 with the Hyper-V role enabled. (Hyper-V Server 2008 and Server Core 2008 are not supported.)

The virtual machines cannot use raw, pass-through, or differencing disks.
WAN support—If your source and target are across a WAN and you want Double-Take Availability to automatically update networking on the guest operating system during failover, the following limitations apply. If you choose not to have Double-Take Availability automatically update networking on the guest operating system during failover, you will have to update the network manually, but the following limitations will not apply.

Windows Management Instrumentation (WMI)—The host and guest operating systems must have the WMI service enabled.
User Access Control (UAC)—UAC must be disabled on the guest operating system.
Name resolution—You must establish name resolution for the guest operating system.

Microsoft .NET Framework—The target server requires the Microsoft .NET Framework version 3.5 Service Pack 1. This version is not included in the .NET version 4.0 release. Therefore, even if you have .NET version 4.0 installed, you will also need version 3.5.1. You can install this version from the Double-Take Availability CD, via a web connection during the Double-Take Availability installation, or from a copy you have obtained manually from the Microsoft web site.

If you are installing on Server Core 2008 R2, .NET 3.5.1 functionality is included with the operating system but is disabled by default. You will need to enable it prior to installing Double-Take Availability. See your Server Core documentation for the specific commands to enable the .NET functionality.