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Dual Boot using Grub and Fibre Channel disks

From: Mark T. Weil
Subject: Dual Boot using Grub and Fibre Channel disks
Date: Thu, 12 Jan 2006 11:25:17 -0700
User-agent: Mozilla Thunderbird 1.0.6 (X11/20050716)

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
title Windows XP
       rootnoverify (hd1,0)
       map (hd0) (hd1)
       map (hd1) (hd0)
       chainloader +1
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/

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