CentOS - Jan 2006 - grub errors after fresh install, partiions with md and lvm

I've done a fresh install on a new system with 2 SATA drives, Seagate
80GB each.  This is the  first time I've done an installation where I
used software raid to provide mirroring capability to the system.  The
raid is level 1 for mirroring.  I used the installation documention on
RedHat's enterprise site to go thru the installation/configuration for
this.  I didn't receive any errors during the installation, but after
the system boots grub issues the following messages:

===============================================================================grub
loading stage1.5.

Error 15
===============================================================================
Using the anaconda graphical installer, I've partitioned the drives as
follows:

/dev/sda
/dev/sdb

/dev/sda1   100mb    /dev/md0   /boot
/dev/sda2   76215mb  /dev/md1   LVM VolGroup00

/dev/sdb1   100mb    /dev/md0   /boot
/dev/sdb2   76215mb  /dev/md1   LVM VolGroup00


VolGroup00    76192mb
    LogVol00            swap   2048mb
    LogVol01   /root    ext3   20480mb
    LogVol02   /home    ext3   20480mb


During my research into the error above, it appears as though grub
cannot find the /boot partition to continue loading the subsequent
stages.  I'm hoping to find some general help from the list if possible.

A couple of questions come to mind.  Can grub boot off of a raid defined
partition?
If yes, what magic incantations would be appropriate?
If no,  should I just revert to a bare ext3 partition and don't
implement raid on
  /boot?

Relavant parts of /boot/grub/grub.conf are:

default=0
timeout=5
splashimage=(hd0,0)/grub/spalsh.xmp.gz
hiddenmenu
title CentOS-4 i386 (2.6.9-22.EL)
        root (hd0,0)
        kernel /vmlinuz-2.6.9-22.EL ro root=/dev/VolGroup00/LogVol01
        initrd /initrd-2.6.9-22.EL.img

And this is CentOS 4.2.

On Mon, 2006-01-16 at 20:59, Keith Morse wrote:
> A couple of questions come to mind.  Can grub boot off of a raid defined
> partition?
No, but with RAID1 it doesn't matter, since it can use either of
the mirrored partitions.
> If yes, what magic incantations would be appropriate?
> If no,  should I just revert to a bare ext3 partition and don't
> implement raid on
>   /boot?
Centos doesn't install grub correctly for RAID.  Just do
the install by hand:
http://www.dirigo.net/tuxTips/avoidingProblems/GrubMdMbr.php
You may have to experiment to see how to make the second
drive boot if the first one fails.  With SCSI, the drives
shift up in both the grub and linux device names.  With
IDE they don't.  I'm not sure about SATA.   In the worst
case you could change the cable and repeat the grub install
procedure if you get the 2nd drive wrong and your primary
fails.

-- 
  Les Mikesell
    lesmikesell at gmail.com