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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.

—- Misc Stuff on Grub:

grub-install –recheck /dev/sdb

More info at:

raid_1_and_xen_dom0.txt · Last modified: 2022/07/19 21:13 by