I installed Proxmox 4 on a Supermicro motherboard, Xeon dual core X3430 2.4ghz CPU with 16GByte of ram. Installed using ZFS raid1 across two 4TB sata 7200 rpm drives. I also added a 2TB 5400 rpm sata drive formatted ext4 and use it only for backups.
I created a KVM VM with 200GB space, 1GByte...