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?