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== Converting a Live Working Xen (dom0) to RAID 1 ==

=== Create RAID 1 with current Live disk Missing ===
 cfdisk /dev/sda
 sda2 = 34850.52

 cfdisk /dev/sdb
 create new primary partition - fs type - linux raid autodetect

 apt-get install mdadm
 #mdadm --create /dev/md0 --level 1 --raid-devices=2 missing /dev/sdb1 --auto
 #it doesnt want the --auto anymore.
 mdadm --create /dev/md0 --level 1 --raid-devices=2 missing /dev/sdb1
 mkfs.ext3 /dev/md0


=== Add support for RAID1 into XEN Boot Module ===
 vi /etc/initramfs-tools/modules
 //add (or uncomment) the line:
 raid1

 mkinitramfs -o /boot/initrd.img-2.6.16-1-xen-k7 2.6.16-1-xen-k7

 vi /boot/grub/menu.lst
 /dev/md0

 mdadm --examine --scan

 vi /etc/mdadm/mdadm.conf -
 DEVICE /dev/sda1 /dev/sdb1
 ARRAY /dev/md0 level=raid1 num-devices=2 UUID=from examine above

 vi /ets/fstab
 //addjust to reflect
 /dev/md0 / ext3 defaults 0 0

=== Mount New RAID 1 and Copy over all File from Live System ===

 mount /dev/md0 /mnt
 cp -dpRx / /mnt

=== Reboot into RAID 1 ===
* Check grub is updated.
 reboot
When the system boots up off /dev/md0 (really its only /dev/sdb1 yet), add /dev/sda2 into the raid1:
 mdadm /dev/md0 --add /dev/sda2

Make sure that /etc/mdadm/mdadm.conf reads correctly.

I didnt install grub onto both hard disks. This can be done via rescue system/cd or whenever the harddisk goes and if the system remains up.

* For info on managing mdadm etc. please consult the main wiki here at: [[Base_Install_of_Debian_Sarge_with_RAID]].
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Misc Stuff on Grub:

 grub-install --recheck /dev/sdb

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More info at:

http://64.233.183.104/search?q=cache:RXj3YD0vHIUJ:alioth.debian.org/download.php/668/rootraiddoc.97.html+raid1+mdadm+setup+debian&hl=en&gl=ie&ct=clnk&cd=1

http://www.debian-administration.org/articles/238