You have the SAS drive connected to the correct port? I have seen some issues where it would install if the it was connected to a "slave" port. I may be wrong but that what some other forum posts have stated.
Do you have the correct SAS driver to load at that startup screen asking for drivers?
Also I have read to disconnect all attached USB drives may help too.
I found this at the MS TechNet forums, this may be the answer you're looking for:
Quote:
Your Windows 7 installation disc does not have the proper storage controller drivers in order to see your drive(s) and/or RAID array.
Get the storage controller drivers that go with your system, in fact download them from the vendor's site to make sure that you have Win7-compatible drivers. Put them on a thumbdrive, plug it into your system then boot up with the installer disc to load up Win7.
When you get to the screen where you expect to see your drives, there's a link on the bottom called 'Advanced'. Click it and you'll see some more options appear, one of which is 'Load Drivers'. Click that then browse to the thumbdrive or wherever you stored the drivers you downloaded, then select the appropriate .inf file. Let Windows Setup finish loading them, then you may need to click the 'Refresh' link in the drive window. At that point your volumes should show up, assuming you got the correct storage drivers.
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Let me know how it works out for you, also be sure you have Windows 7 compatible drivers ready on your thumb drive. Either x64 or x86 (32-bit) for whichever version of Windows 7 Ultimate you're installing.