I have a PET310 server with 4 hard drives, One quad-core processor and 24GB ram. The first two hard drives are SATA 7.2k 'near line sas' drives and are 500GB each on a Raid 1. The second two drives are SAS 15k drives and are 600GB each on a Raid 1. I know its best to keep each vm that I create on their own disks and partitions, however, I am installing a domain controller and file server at a new site and have this server to work with. My current config is this: I have all the vm's on the second 600GB Raid1 set. I created two vm's. One vm is the file server that is 430GB in size and the second VM is the dc and that is 80GB in size. I am wondering if I will have issues with the DC and the File server fighting for resources since they are both on the same disk. I'm considering moving the DC's vhd file over to the First raid set (The same disk and Raid set the Host OS is occupying). I'm trying to determine the best method and if I should leave it the way it is or move the dc as I stated to the first Raid set. That will leave me more room for the file server on the second Raid set but may present problems with systems resources for the DC since its on the first disk? Any suggestions or thoughts would be appreciated. I can always keep the DC role and file server on the same vhd if that makes more sense instead of creating two separate vms. thoughts?