[lug] grub.conf and BIOS drive specifications

[D. Stimits]

I'm trying to figure out, on a machine with both IDE and SCSI 
integrated, when booting from SCSI (the bios is set to boot scsi first), 
or when booting from IDE (the bios is set to boot ide first), the 
grub.conf still calls the boot device hd(0), despite the device changing 
from scsi to ide or back. I'm trying to figure out a way that I can name 
across both scsi and IDE, e.g., have /boot/ on scsi first drive, but be 
able to name a root partition for one case as the ide drive, and in the 
other case the scsi. The number of scsi disks varies, so I can only 
predict there will be at least one scsi device, and exactly 1 ide hard 
drive (plus ide cdrom).

Since hd(0) only refers to the first drive, but does not tie it to a 
particular controller (bios settings change which it calls the first 
drive), in a mixed ide/scsi environment, how do I specify specifically 
the first scsi drive? Or specifically the first ide drive? I suspect 
there is a way to use BIOS drive number to do this, but I'm not familiar 
with how the BIOS labels can be extracted or identified. Can I extract 
BIOS drive numbers in a way that allows me to name the first drive of 
scsi or the first drive of ide, and not depend on what the BIOS setting 
is for boot scsi first or boot ide first? And in a way that won't change 
the drive number of the IDE drive when I alter the number of scsi drives 
plugged in to the backplane?

D. Stimits, stimits AT comcast DOT net