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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

I've seen a few questions about this but no answers. Here is the 

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 

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 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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