>That is really a shame. Because if there is one thing that might cause performance problems, then it would be disk I/O.

Yes, but I doubt some virtual VM hosts would allow the customer to dictate what would be or to request a specific disk infrastructure just for them.

>We still have virtualized the whole server, so no hardware dependency either, meaning we have multiple servers and workstations running on the physical machine. The ISP has installed the virtualized servers for us, they providing the licenses. Since we have an MSDN subscription we have installed the workstations under our license. We have full control on the configuration of the physical machine and the VMWare ESXI installation.

That is like the first ISP recommanding me a dedicated hardware.

As far as VMWare goes, we use that one in another hosting center for a different product. I do not configure that one however as I only collect technical details.