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From: Thomas P Brisco on 25 Feb 2007 08:57
I've got FC6 up and running on a system with a Intel DP965LT motherboard;
but I've noticed some oddities with having both SATA and IDE (PATA) drives
on the system.

If I boot off a SATA drives, the IDE/PATA drives never appear. In the
system BIOS, I can see them just fine. I can even select them for boot,
and boot attempts (never completes due to drives moving around).

I'd read in some other areas that with the P965LT that selecting drive
setup in the BIOS as AHCI instead of IDE for the SATA drives will enable
DMA access to them (and, hopefully, fixup my IDE woes). Trying this
results in a flashing message (looks like an error) during boot, and then
I can't see any disks at all.

Checking Intel's site, there seems to be some BIOS upgrades related to
SATA/AHCI behavior - but I'm not 100% sure that that is my problem (and,
for obvious reasons, I look to avoid unnecessary BIOS flashing).

Should I be looking to be using a AHCI type of driver for best performance
with my SATA disk drives, or is SCSI emulation the best way to go about
this? I expect that if I can get away from IDE-like modes in the BIOS,
that I'll be able to see my real IDE devices once again.

(I've been using Linux for quite a few years, but have recently
"come back" to redhat).
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