If a physical server is being used for virtualization, I'd recommend not to run any other services on it (no AD, no fileserver, etc). Instead run those services in virtual machines instead and let the physical server focus on the virtualization only.
I am after some advice for setting up a T310 for vitualisation in a very small network. I am setting up a R200 as the main server. The hardware is single X3320, 8Gb RAM + 2 x 250GB disks RAID 1 on SAS6iR controller. The software will be SBS 2008 premium setup as PDC, AD, DNS and will have Exchange installed with web access. The secondary server is a T310 which I want to set up to do the following; The hardware is a  single X3440, 32Gb RAM + 4 x 500Gb disks on Perc 6 RAID 5 (1 hot spare) + 2 x 1TB disks on a SATA controller for backups only. Supplemental backups will be done onto NAS devices. I have a third server which is a 2850 with 2 x Xeon CPUs,  8GB RAM, 6 x SAS 146G disks. This machine I am not sure what to do with just yet but may end up being a backup/development box. The additional software I have is a Server 2008 (from the SBS 2008 premium package) + Server 2008 R2 standard + SQL 2008 + the OSs for the child partitions I want to set up on the T310. The questions I have regarding the T310 are; 1 –Is is best to install in the parent partition: a)      Full Server 2008 with Hyper-V role b)      Full Server 2008 R2 with Hyper-V role c)       Core Server 2008  with Hyper-V role d)      Core Full Server 2008 R2 with Hyper-V role e)      Hyper-V Server 2012 2 – Where should I locate the File Server role ? 3 – Is the following disk space setup on RAID 5 the most suitable raid to use on the T310;                 C: 100GB for parent OS                 D: 150GB for documents                 P: 32GB for page file                 V: Remaining space for VHDs At some point I will need to set up Terminal Services/Remote Desktop Services too. Any guidance would be much appreciated.
Virtualisation Server Setup