> I think most VPS hosting providers are running on VMWare. Out of date info, but last time I really looked there used to be 3 tiers of VPS provider: * VSpher

> I think most VPS hosting providers are running on VMWare. Out of date info, but last time I really looked there used to be 3 tiers of VPS provider: * VSphere with SAN and blades (I think there was an HP reference implementation for this - many providers seemed to use it). These were by far the most expensive, and not really very good performance for the money due to SAN speeds and ESX not cpu scheduling multi core VMs that well. * Xen/KVM. Mid range in terms of cost, and less fault tolerant than the SAN backed VSphere stuff. But usually out performed it. * VServer / OpenVZ at the very cheap end. These were more like early LXC containers than VMs. The price point meant that you got what you paid for, and there were tech limitations with what you could do with the kernel (they were sharing the host kernel). Security wasn't great either. I doubt the VMWare providers are as common now as they were 15yrs ago though. Even back then, they weren't the most common though.