Nowadays everyone virtualizes. SQL Server is no exception. VMware is the most common hypervisor by far (sorry Hyper-V) so it is very beneficial for DBAs to know their way around vSphere, understand how to optimally configure SQL Server and VMware to work together, and know the red flags to watch for performance.
This is part 2 of a 3 part series about SQL Server Environmental Diagnostics. Check out Part 1 and Part 2 as well.