The original pair of VBlock’s were purchased to replace a hodgepodge of small VM clusters of 3 to 4 VM hosts and an outdated SAN, in addition to moving from an old data center to a new data center. Moving the VM’s from the old systems to the new VBlock --which had more shared resources and a newer VMware version-- was a big win. Once in place, we virtualized as many servers as could be converted from freestanding servers to a VM. The only exception was when the licensing of an application was cost prohibitive; we keep these on stand-alone hosts. This was mainly due to application licensing bias, rather than limits on virtualization.