I have a JMicron raid controller on the motherboard, and I have a menu in which I can set RAID arrays when the system boots. I've set it to RAID-1 and added my two identical 2TB disks (the OS disk is separate).
In Ubuntu, in the Disk Utility, I could see these 2 hard disks and I could see an additional entry under Peripheral devices which was a 2TB disk. I assumed that this is some sort of a virtual view over my RAID array.
I used the Format Volume option to format (NTFS) the 2TB disk listed under Peripheral devices. It appeared as a mounted device in the /media/data_raid. I've copied most of the files there and it worked fine.
I've rebooted the system, and now I suddenly see an additional 3 disks in peripheral devices, which doesn't make sense. Also, I can no longer mount the /media/data_raid - clicking on it in Gnome yields the following error message.
"One or more block devices are holding /dev/dm-0"
This is how things look in Disk Utility:
There are additional 3 entries in /dev/mapper for some reason:
~$ ls -l /dev/mapper
total 0
crw------- 1 root root 10, 236 2012-05-01 20:01 control
lrwxrwxrwx 1 root root 7 2012-05-01 20:15 isw_bjcjaghhjj_DATA -> ../dm-0
lrwxrwxrwx 1 root root 7 2012-05-01 20:01 isw_bjcjaghhjj_DATA1 -> ../dm-1
lrwxrwxrwx 1 root root 7 2012-05-01 20:01 isw_bjcjaghhjj_DATA2 -> ../dm-2
lrwxrwxrwx 1 root root 7 2012-05-01 20:01 isw_bjcjaghhjj_DATA3 -> ../dm-3
Can you help me resolve this issue and obtain access to my RAID array again?
Thank you.
EDIT:
There is no mdadm.conf in /etc/.
In /etc/fstab/:
# /etc/fstab: static file system information.
#
# Use 'blkid' to print the universally unique identifier for a
# device; this may be used with UUID= as a more robust way to name devices
# that works even if disks are added and removed. See fstab(5).
#
# <file system> <mount point> <type> <options> <dump> <pass>
proc /proc proc nodev,noexec,nosuid 0 0
# / was on /dev/sda1 during installation
UUID=8e466cac-6543-48dc-aedf-ce378375053b / ext4 errors=remount-ro 0 1
# swap was on /dev/sda3 during installation
UUID=f80e449c-4212-45e6-939c-f16a55ae8ad5 none swap sw 0 0
