Microsoft recently released a new paper titled Remote Desktop Virtualization Host Capacity Planning in Windows Server 2008 R2.
The 30-pages document provide guidance on how to properly size a VDI environment powered by Hyper-V and the Windows Server 2008 R2 connection broker:
This document presents some preliminary guidance and data around capacity planning for RD Virtualization Host and should be regarded as an update to the “Remote Desktop Session Host Capacity Planning in Windows Server R2” document. As such, it focuses mostly on the RD Virtualization Host-specific aspects of the capacity planning exercise, and briefly summarizes most of the facts that are equally applicable to both types (virtual and session) of Remote Desktop Services deployments. For a more complete understanding of all the considerations and guidelines, it is highly recommended that you read the RD Session Host white paper. The results presented in this document are based on a few scenarios that use Microsoft® Office applications. The document also provides basic guidance on the hardware and software parameters that can have a significant impact on the number of virtual machines that a server can support effectively.