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Red Hat, Raid and Grub
From: |
Cormac McGaughey |
Subject: |
Red Hat, Raid and Grub |
Date: |
Thu, 15 Aug 2002 18:22:26 -0700 |
Hi,
I've seen a few questions about this but no answers. Here is the
problem:
In redhat if you are booting to a raid device and you are using grub
you will find some strangeness. You will see:
o You update grub, and it doesn't change at boot up
o Grub breaks, but everything seems ok when you look in /boot/grub
I had these issued. I was running redhat 7.3, with a Raid 1 array,
and ext3. I updated my kernel and grub successfully booted the old
kernel that no longer existed.
After much work I discovered something nasty. When you boot from a
raid device in redhat, /boot is not really /boot. To fix your grub
issues you have to do this (change drives to refect your own
settings):
init 1
...
umount /dev/md0
mount /dev/hda1 /tmp
cd /tmp/boot
You'll now be in the /boot that is used at boot time. You can fix any
grub problems you had in this version of /boot, and they will work. I
don't think /dev/md0/boot is ever used at all.
This should allow you to solve most raid grub issues.
Cormac
--
Cormac McGaughey
Computer Support Specialist
Institute of Technology
Harmon 307
University of Washington Tacoma
1900 Commerce St. Box 358426
Phone: 253-692-4648
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