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HOWTO: Convert from single disk to RAID 1 without reinstalling
30/12/08
02:59:11 pm, by richard 
, 2695 words 
Categories: HOWTOs, Ubutnu Linux, Installation and Configuration, OS and Systems Administration
HOWTO: Convert from single disk to RAID 1 without reinstalling
Reboot using the Ubuntu ALT installation disk and choose Rescue a Broken System, a rescue disk of your own or to single user mode. If you use the Ubuntu disk do not mount the old root as the root at this time. It makes the copying part a little more complex. 
I used /dev/md0
Mount the old root partition and then copy the old data over.
mkdir -p /mnt/old_root
sudo mount /dev/sda1 /mnt/old_root
df -h
sudo mount /dev/sda1 /mnt/old_root
df -h
Output from dh command
Filesystem Size Used Available Use% Mounted on
tmpfs 507.7M 44.0k 504.7M 0% /dev
/dev/scd0 696.8M 696.8M 0 100% /cdrom
/dev/sda1 3.7G 2.3G 1.4G 63% /mnt_old_root
/dev/md0 3.9G 32.1M 3.9G 1% /target
tmpfs 507.7M 44.0k 504.7M 0% /dev
/dev/scd0 696.8M 696.8M 0 100% /cdrom
/dev/sda1 3.7G 2.3G 1.4G 63% /mnt_old_root
/dev/md0 3.9G 32.1M 3.9G 1% /target
cp -a /mnt/old_root/* /target
Once the copy has completed we can reboot back into the old setup and mount the array temporarily in /mnt/mirror. I find it simpler to edit in the real system as I just cannot get on with vi. The reboot also gives me an excuse to get another coffee. 
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