I had a thread earlier asking for help installing Ubuntu Server to my homemade atom based NAS, but I gave up on that (GUI's are more helpful to me ) and so now I'm running Ubuntu 10.10 Desktop 64bit edition.
Last night I was finally able to get mdadm set up. I have two 1TB disks set up in RAID1 config. I used
to create the array, and then waited until it finished assembling. Then I used System>Administration>Disk Utility to create a ext4 partition on the /dev/md0p1 device.
sudo mdadm --create /dev/md0 --level=1 --raid-devices=2 /dev/sdb1 /dev/sdc1
Finally, I modified /etc/fstab in the following manner
to try and automount the raid partition.
proc /proc proc nodev,noexec,nosuid 0 0
/dev/sda1 / ext4 errors=remount-ro 0 1
/dev/sda5 none swap sw 0 0
UUID=a58e62e0-e3b5-438c-98d5-23268689ea84 /media/galaxy ext4 defaults 0 0
After rebooting however, Ubuntu said it was waiting for /media/galaxy to be mounted. After a few minutes I decided to skip it, and noticed that /dev/md0 was no longer available. I ran
but there was no listing of my raid device. I tried to click my way around. In Disk Utility again, I could see a 0.0Kb raid array, clicked 'Stop RAID Array', then 'Start RAID Array', and suddenly my 1TB /dev/md0 array reappeared!
ls -l /dev/disk/by-uuid
I'm not sure what I just did, but I'm hoping somebody can tell me what step I might have missed. Do I need to do something to have mdadm properly load the raid array upon bootup?