As a real-time application, Lync Server 2013 requires careful planning when deployed on virtual environments. Performance issues caused by shared resource constraints are hardly noticeable in many applications, but in Lync Server they can cause audio and video issues that make for poor user experience.
This paper provides many configuration recommendations for running Lync Server 2013 in a virtual environment, both for the host servers and the guest servers. It details the 10 most important Key Health Indicators (KHIs) that you should watch both when performing a capacity test prior to deploying, and during deployment. It also explains observations and results from the capacity testing Microsoft performed in a virtualized test environment.