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I have 4 x 6TB hard drives which has been setup for RAID 10 in the BIOS (option rom: Intel RST (v12.7.0.1936)) on my P6T7 WS ASUS Motherboard with modded bios (BIOS) which works :

lrwxrwxrwx 1 root root 3 Jul 29 00:06 /dev/raidDevice1 -> sda
lrwxrwxrwx 1 root root 3 Jul 29 00:06 /dev/raidDevice2 -> sdb
lrwxrwxrwx 1 root root 3 Jul 29 00:06 /dev/raidDevice3 -> sdc
lrwxrwxrwx 1 root root 3 Jul 29 00:06 /dev/raidDevice4 -> sdj

When I start Ubuntu 14.04 -> (mdadm is installed) then i get some kind of device mapper devices (dm0/dm1/dm2)? What are those? Are these already my raid? But it should be only one device and exactly 12TB big (Raid 10, 4 Hds 6TB = 12TB)?

lsblk gives:

NAME                           MAJ:MIN RM   SIZE RO TYPE    MOUNTPOINT
sda                              8:0    0   5.5T  0 disk    
└─isw_biajiifeeg_vol0-1 (dm-0) 252:0    0   1.5T  0 dmraidi 
  └─isw_biajiifeeg_vol0 (dm-2) 252:2    0   2.9T  0 dmraid  
sdb                              8:16   0   5.5T  0 disk    
└─isw_biajiifeeg_vol0-0 (dm-1) 252:1    0   1.5T  0 dmraidi 
  └─isw_biajiifeeg_vol0 (dm-2) 252:2    0   2.9T  0 dmraid  
sdc                              8:32   0   5.5T  0 disk    
└─isw_biajiifeeg_vol0-0 (dm-1) 252:1    0   1.5T  0 dmraidi 
  └─isw_biajiifeeg_vol0 (dm-2) 252:2    0   2.9T  0 dmraid  
sdj                              8:144  0   5.5T  0 disk    
└─isw_biajiifeeg_vol0-1 (dm-0) 252:0    0   1.5T  0 dmraidi 
  └─isw_biajiifeeg_vol0 (dm-2) 252:2    0   2.9T  0 dmraid  

The disk utility shows the following:

diskutil

I dont know what to do now to use this raid 10 configuration? Should I still doo the following setup as described in (page: 9 in INTEL PDF MANUAL) which is:

 mdadm -C /dev/md/imsm /dev/sda /dev/sdb /dev/sdc /dev/sdj -n 4 -e imsm
 mdadm -C /dev/md/vol0 /dev/md/imsm –n 3 –l 10

Does somebody know what to do know or do differently? I actually wanted to delete the funny devices /dev/dm* mdadm --remove /dev/dm0

1 Answer 1

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I finally made it:

THe problem was that dmraid (the former mdadm) wos installed which is legacy, I uninstalled that via apt-get. Then created the raid with

 mdadm -C /dev/md/imsm /dev/sda /dev/sdb /dev/sdc /dev/sdj -n 4 -e imsm
 mdadm -C /dev/md/vol0 /dev/md/imsm –n 3 –l 10

And now the output looks like this (AWESOME :)

enter image description here

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