Did you know that VMware ESX 4 can even virtualize itself? That's right, you can run the VMware ESX 4 hypervisor on top of another VMware ESX 4 hypervisor in a nested configuration. You can even VMotion a running VM from an ESX hypervisor installed on the bare metal to a virtual ESX hypervisor on the same physical server. So, when I first heard this, the question was "Why would you do this?". more...