The next phase beyond node resource usage is resource usage across your cluster. As previously noted, an extra application layer, such as System Center Virtual Machine Manager, can perform this load balancing automatically. Without this software, you will need to perform load balancing manually. Also, in some cases, you may wish to exert manual control over specific virtual machines. For instance, if you are using the built-in high availability features of some applications, such as Microsoft SQL Server or Exchange Server, you may want to ensure that particular virtual machines never share the same host. You may also be using clustering with Hyper-V Server with the intent of keeping particular application servers logically arranged more than providing failover. For instance, the following is a planning diagram for a Microsoft Lync system running on a Hyper-V Server cluster:

A Lync frontend server involves very heavy usage of CPU and having two on the same physical host...