Converting a non-RAID RedHat System to run on Software RAID

["Eric Wood" <eric@interplas.com>]

I frequently want to convert an existing single drive install of RH linux
into a mirrored RAID-1 set.  So I thought I found the holy grail:

http://unthought.net/Software-RAID.HOWTO/Software-RAID.HOWTO-4.html#ss4.14

However, it is slightly out dated (RH 7.1 days).  Since I'm trying to mirror
RH 9, I have several questions based on this HOWTO:

1. Sect. 4.14.6: /dev/md0 already existed while in rescue mode.  Ignored it,
no problem
2. Sect. 4.14.7: I could not umount /mnt/sysimage to save my life.  Looking
at what was mounted, I seen that I needed to also umount
/mnt/sysimage/dev/pts.  I cd'd into the / directory to make sure I wasn't
holding the unmount up.  So I could not proceed with the howto.

3. Sect. 4.14.11,12 should be updated to include grub.

4. Sect. 4.14.14.  Do I first have to convert from ext3 back to ext2? Since
I use ext3 does this step still apply or does mkraid at the second
superblock in an acceptable manor for ext3?  Do I still have to resize2fs
the md devices?

Any info I gather, I will relay to the howto author and hopefully he'll come
out with an update.
thanks,
-eric wood