Hi Josh,
Thanks for answering.
Makes sense that when using individual disks for each guest OS, most of them will be constantly in idle. But in that case I think I would still separate the mass storage as that is only used occasionally during the day. The OS's could all run from a single storage group. But what kind of storage setup will be good enough to host several guest hosts without being a bottleneck?
When I go through the documentation I mainly read about SAN storage, iscsi, nas, but hardly about local storage. I also read somewhere (not sure where anymore) about a setup where ssd's are combined with sata, creating a kind of hybrid. Not sure if I can accomplish such with local drives.