If I understand correctly, you have a physical server that has a disk array attached to a physical SCSI adapter on the host computer. If that's the case, then your configuration should be fully supported - as long as the host system can see the disks, you can create virtual machines (VMs) and virtual hard disks (VHDs) on that array.
I think the issue you're having is that you're trying to use your SCSI controller's driver during OS (operating system) installation within a guest OS. That won't work. What you need to do is use Virtual Server's SCSI shunt driver during the guest OS installation process. The process is pretty simple: Just attach the "SCSI Shunt Driver.vfd" file to the VM's virtual floppy disk drive. By default, the .vfd file is located in "C:Program FilesMicrosoft Virtual ServerVirtual Machine Additions". During the installation process, tell the guest OS that you have a third-party SCSI driver available and then supply the virtual floppy disk.
The bottom line is that you need to provide drivers for the emulated SCSI controller, not the drivers for the host's physical controller. I hope this is helpful. If not, feel free to follow-up. Good luck!
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