SBS 2008 Premium - virtualising host and HDD setup Questions

I am setting up an SBS 2008 premium server with 24GB ram.
I will setup a host 2008 server, then SBS2008 virtualised and 2008 STD server virtualised.

I have 2 X 146GB SAS drives (for OS) and 4 X 500GB drives. (for data)

I was considering installing the host on the mirrored 146GB drives, but should I have the 2 other OS on seperate drives to the host? what size would you suggest for partitioning for the host SBS premium and 2008 STD. Is this HDD size too small? should I look at another mirrored 148GB SAS for SBS server?

I noticed with my test install I am able to partition the SAS drive to 148GB and install 2003 server. Then I was able to create another 2 virtual servers on that same partition. Is this how its supposed to work, or should I setup a 10GB partition for the host and leave the rest unpartitioned?

Bit confused on best way to do this. thanks!
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I setup a server with almost exactly the same config using hyper-v r2 as the OS (free). Installed it on mirrored 146 GB SAS drives. Then created two 500 GB raid 1 arrays for VM's. I have SBS on one Raid 1 array and 3 other low use VM's on the other. You could install VM's on the 146 GB array if you want and it probably won't effect performance depending on the VM load. The only downside of using Hyper-v r2 is you need an external domain controller and either Windows 7 or Win2k8 to manage it.
If your doing a single server setup I think VMWare is a better fit.
Jamesm007Author Commented:
"The only downside of using Hyper-v r2 is you need an external domain controller and either Windows 7 or Win2k8 to manage it. "
I am using a 2008 server STD install with Hyper V service enabled on it. Does this change anything?

Also I have 2 NICs on the server. MS suggest to allow 1 for external management. In order to have an internal and external nic, I will need another physical NIC to do this?
Windows 2008 has hyper-v manager already. I was only talking about hyper-v r2 which is a bare metal install similar to 2008 core. You won't need an external DC with your setup.

The server I used already had a 4 port NIC so I assigned each VM its own NIC. You probably should add at least one more NIC.

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Jamesm007Author Commented:
Thanks for the tips, have added 2 more Itel PRo server nics for good measure!
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