Rainer Duffner wrote:
VMware Server needs some OS as base (CentOS5 should do well), but 3i goes on the bare metal - it's based on RHEL, too, though.
ESX is not based on linux at all. ESX(not ESXi) includes a service console that is based off of RHEL-3 though that is for management only, virtualization runs entirely within the hypervisor which is transparent to the user.
There is also a linux compatibility layer I believe for drivers.
ESXi did away with the service console concept almost entirely.
nate