Question on Xen Orchestra and vm storage

My friend and I are starting a MSP and was wondering does Tom use freenas to store his vms on for Xen or does he have a hardware raid on the server Xen is installed on?

I have both, I can run the VM’s using the storage on the server or the storage on the FreeNAS

Did you have to put your raid card in IT mode for the raid on the server?