The 1950 does not support SCSI (so drives must be SATA or SAS) and it has a backplane that is integral to the system's design (must be there), so the backplane must connect to some sort of controller.  The 1950 only supports the PERC 5/6 and the SAS 5/6.  If you have a CTRL-C option during POST, then you have a SAS 5/6.  The SAS 5/iR and the SAS 6/iR both support RAID (the SAS 5/i does not - no 'R'), and both support non-RAID (meaning drives can be utilized individually - not in a RAID array, when left unconfigured). You will need to make sure you are using this driver:[URL] Minimum SAS 5 FW package version: 00.10.51.00.06.12.05.00Minimum SAS 6 FW package version: 00.25.45.00.06.22.02.00 If your controller firmware is very old, you will need to use this one:[URL] Minimum SAS 5 FW package version: 00.10.51.00.06.12.04.00Minimum SAS 6 FW package version: 00.20.43.00.06.14.08.00 Alternatively, you could use the installation utility ... it walks you through setting up RAID and installs all needed drivers along the way.  Your 2003 media will have to have SP2 on it though. [URL] 
Hello, I am trying to install Windows server 2003 R2 on a Dell Poweredge 1950, with a SCSI array using two 250GB hard drives. The issue I'm having is that upon installing Windows it informs me it cannot see any hard drives at all. I know they are there and Windows 2003 is meant to have the SCSI drivers in it's installer already and I've used a Floppy to provide them manually but it still fails. Please help me I need to get this installed. Jason
Urgent help with Windows Install on Poweredge 1950