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Server 2008 R2 and SAS/Raid

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I hope I'm just missing something simple, but I'm having a problem building an SQL server for my wife's small office. This question crosses between multiple forums, so maybe it should be elsewhere - sorry.

I have a Supermicro X9DR3-F dual LGA2011 mobo, a chassis with an SAS backplane, hoping to make a server running Server 2008 R2 Standard. The six SAS drives are configured as a Raid1 array for the OS and a Raid10 for SQL. The motherboard has an Intel C606 controller.

I've tried to get tech support from both my vendor and SM, but they seem to be pointing at each other with no great urgency.

When I attempt to install the OS, it can't find the drives. When I provide the driver disk, I get a "there are no signed drivers" error.
Browsing the disk makes it seem there are drivers, but perhaps they are unsigned - don't know if the error message discriminates between unsigned and none.

I'm trying to find a fallback strategy, and most of the hardware is not returnable. I can't give up the OS and I really want to retain the SAS drives. The "OS Compatibility Chart" on the SM site is sort of vague about OS support (the footnotes don't indicate whether a given config was"tested" or "possible"). It does show that another mobo (X9DRW-3F) does support SAS/Raid with the OS, but the puzzle is that the boards are both LGA2011 based with the C606 controller. Why one would support it but not the other seems strange.

One approach would be to install on a temporary SATA drive, install unsigned drivers (if there are any), and then clone the disk to the SAS/Raid1 array. Any reason this wouldn't work? Does the OS check the driver signing every time it boots? I think there are workarounds for that, but I'm not positive.

Maybe someone has already dealt with this problem?

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