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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:

the original drive

the newly appeared drive

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.

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Is this a fresh installation of 12.04 or did it already work with this version? Because I had problems with my RAID too, after first boot. –  Bevor May 1 '12 at 19:24
    
This is Ubuntu 11.10. I did not update to 12.04 yet. –  axel22 May 1 '12 at 19:33
    
@Bevor: What did you have to do with 12.04? –  Kyle Brandt May 2 '12 at 18:54
    
@KyleBrandt That was my problem: unix.stackexchange.com/questions/37567/… –  Bevor May 2 '12 at 19:20

2 Answers 2

I have the exact same issue, trying to partition/format two 2TB RAID0 disks. I'm running hardware raid set in bios because I've read it's faster than software raid and doesn't load the CPU as software raid does.

I installed GParted and with that I could make a partition and format the RAID disks.

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Avoid using mainboard inbuilt Fake Raid, use Linux Software Raid instead. In Dual Boot environments use a NAS or another machine acting a as NAS, which mostly boils down to Linux Software Raid running on that machine. That solution is reliable, which is what you want to achieve by using Raid. Relying on Fake Raid is anything but reliable.

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