Dual Boot using Grub and Fibre Channel disks

[Mark T. Weil]

We don't know how to get Grub to see multiple fibre channel disks.

W have an HP workstation with a Qlogic 2340 fibre channel card installed 
in a PCI slot.
Within the Qlogic BIOS we are able to see LUN 0, and LUN 1.
We first install Linux RHEL 4 Update 2 on LUN0, and Windows XP on LUN1.
By altering the primary boot position within the Qlogic utility we can 
boot either operating system.
The problem comes in when  Grub is asked to boot the windows partition. 
From what we can tell
Grub cannot see the second LUN. If we interrupt grub during stage2 and 
get a command line and type geometry (hd0) and geometry (hd1) we only 
get valid data from hd0, but if we do the exact command from a full up 
linux os we get valid data for both hd0 and hd1.

The following grub.conf setup works with two locally attached scsi disks 
but fails with the fiber channel configuration. It appears that the 
fiber channel disks are treated differently. Any ideas???

# grub.conf generated by anaconda
#
# Note that you do not have to rerun grub after making changes to this file
# NOTICE:  You have a /boot partition.  This means that
#          all kernel and initrd paths are relative to /boot/, eg.
#          root (hd0,0)
#          kernel /vmlinuz-version ro root=/dev/sda2
#          initrd /initrd-version.img
#boot=/dev/sda
default=0
timeout=10
splashimage=(hd0,0)/grub/splash.xpm.gz
hiddenmenu
title Windows XP
       rootnoverify (hd1,0)
       map (hd0) (hd1)
       map (hd1) (hd0)
       chainloader +1
       makeactive
title Red Hat Enterprise Linux WS (2.6.9-11.ELsmp)
       root (hd0,0)
       kernel /vmlinuz-2.6.9-11.ELsmp ro root=LABEL=/ acpi=off rhgb quiet
       initrd /initrd-2.6.9-11.ELsmp.img

--
Thank you,
-------------------------------------------------------
Mark Weil             +   ESHPC Team
Sandia National Labs  +   address@hidden
Albuquerque, NM       +   845-2243
505-284-5217          +   http://9324.sandia.gov/eshpc/