I have a machine with 3 identical disks. I performed a clean installation of ubuntu 12.10 on one disk.
How can I convert the running system to boot off a (software) raid5 comprised of all three disks (one of these is in use running the system)?
Is it possible to start a raid 5 md device in degraded mode using 2 disks(disks 2&3), copy the data over from disk1, boot of of 2&3 (raided 5) and then add disk1 into the md device and let them resync? If possible, how would I got about doing this? what are the steps I need to perform? and if possible, do you know of a tutorial I can follow?
[I know something similar is possible if you want to boot off of a RAID 1, you started a degraded device and add the first disk later]