I just made a fresh install of Ubuntu 12.10 on a new SSD (/dev/sda
). Now I would like to add two 1TB drives (/dev/sdb /dev/sdc
) in RAID 1 but I'm pretty clueless on how to do it.
This is what I came up with (but didn't work):
First created partitions on the new drives:
sudo fdisk /dev/sdb
created primary partition and write table to disk
After that:
sudo mdadm --create --level=1 --name=raidarray --raid-devices=2 /dev/sdb /dev/sdc
However this outputs:
mdadm: device /dev/sdb exists but is not an md array.
Can somebody point me in the right direction on how to do this?
One bonus question: Would it be possible to reserve a part (same size of SSD) of one HDD and create a RAID 1 with the SSD and part of the HDD. And if so, how and can I keep my installation?
Best Answer
The default command should look like this:
You are not adding a complete disk, you should add a device (use
/dev/sdb1
(or2), not just/dev/sdb
) as far as I know. The target name (/dev/md0
) was also missing.I always use this cheatsheet: http://www.ducea.com/2009/03/08/mdadm-cheat-sheet/ :D