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Full Discussion: Root mirroring in SUSE 10.1
Operating Systems Linux SuSE Root mirroring in SUSE 10.1 Post 302483707 by pludi on Tuesday 28th of December 2010 11:01:54 AM
Old 12-28-2010
Alright. I've asked about the partition layout since it seems quite strange: 3 logical partitions (2 Linux + 1 Swap) inside an Windows extended partition isn't what you usually find in an production environment. A virtual machine might have been better for testing, since you could create snapshots to go back to if a step fails.

I'll try to create a suitable checklist/how-to, but it might take some time. Things like this shouldn't be rushed...

---------- Post updated at 17:01 ---------- Previous update was at 12:39 ----------

Alright, I think I've got it.

DISCLAIMER:
This procedure is extremely dangerous and should not be applied to any production server without a proven good backup. Neither I nor this site can be held accountable for any data loss you might encounter. Really.
  1. Boot to "Rescue mode" using the installation CD
  2. Replicate the partition layout:
    Code:
    sfdisk -d /dev/sda | sed -e 's/sda/sdb' | sfdisk /dev/sdb

  3. Change the partition type of /dev/sdb6 to "RAID autodetect"
    Code:
    echo -e "t\n6\nfd\nw" | fdisk /dev/sdb

  4. Create the array with 1 disk missing (will be added later)
    Code:
    mdadm --create /dev/md0 -l 1 -n 2 -x 0 /dev/sdb6 missing

    #
  5. Create a filesystem on it
    Code:
    mkfs -t reiserfs /dev/md0

  6. Mount the old and new "root"
    Code:
    mkdir /tmp/old
mount /dev/sda6 /tmp/old
mkdir /tmp/new
mount /dev/md0 /tmp/new

  7. Copy over the old contents (could take a while)
    Code:
    cd /tmp/old
find . -xdev | cpio -pmdV /tmp/new/.

  8. Cross your fingers, because after the next step the original system is probably not salvageable.
  9. Unmount the old "root" and change the partition type
    Code:
    cd /tmp
umount old
echo -e "t\n6\nfd\nw" | fdisk /dev/sda

  10. Add the "old root" to the array so it can rebuild in the background
    Code:
    mdadm --add /dev/md0 /dev/sda6

  11. chroot into the new array to make needed changes. Do not exit the chroot until told to do so
    Code:
    chroot /tmp/new

  12. Mount some needed stuff
    Code:
    mount -t proc proc /proc
/etc/init.d/boot.udev stop & /etc/init.d/boot.udev start

  13. Replace sda6 with md0 in these files: /boot/grub/menu.lst, /etc/fstab
  14. Install Grub on both disks (the '>' indicate to enter this at the Grub prompt and are not part of the command)
    Code:
    grub
> root (hd0,5)
> setup (hd0)
> root (hd1,5)
> setup (hd1)
> quit

  15. Create a suitable mdadm.conf
    Code:
    echo "DEVICE partitions" > /etc/mdadm.conf
mdadm --examine --scan >> /etc/mdadm.conf

  16. Rebuild initrd (replace xxx with the appropriate file)
    Code:
    cd /boot
mkinitrd -k vmlinux-xxx -i initrd-xxx

  17. Umount and exit the chroot
    Code:
    /etc/init.d/boot.udev stop
umount /proc
exit

  18. Check the rebuild status with mdadm --detail /dev/md0
  19. When the array is done rebuilding shutdown -r now
  20. Hope that do didn't do anything wrong
This User Gave Thanks to pludi For This Post:
sri243
 

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