RAID 1 and Xen (dom0)

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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:
mkinitramfs -o /boot/initrd.img-2.6.16-1-xen-k7 2.6.16-1-xen-k7
vi /boot/grub/menu.lst
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.

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.

Misc Stuff on Grub:

grub-install --recheck /dev/sdb

More info at:

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