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The following confuses me:

[root@mrak ~]# mdadm --examine --scan
ARRAY /dev/md/0  metadata=1.2 UUID=d3f800db:26de8691:dc0caf45:0f75028b name=mrak.dex.internal:0
ARRAY /dev/md/0  metadata=1.2 UUID=1870fd84:2234e3d4:580f7634:b0b621e7 name=mrak.dex.internal:0

This array is RAID10 comprising 4 Seagate Momentus XT 750GB disks. The active RAID's UUID is d3f800db:26de8691:dc0caf45:0f75028b. Can someone explain to me why am I getting the second ARRAY line?

Also, why I do not see /dev/sdb1, /dev/sde1 and /dev/sde1? Those are all partitions used to build the array, that are of type "Linux raid autodetect".

If I get details for /dev/md/0 I get:

[root@mrak ~]# mdadm --detail /dev/md/0
/dev/md/0:
        Version : 1.2
  Creation Time : Fri Feb  8 12:47:03 2013
     Raid Level : raid10
     Array Size : 1464886528 (1397.02 GiB 1500.04 GB)
  Used Dev Size : 732443264 (698.51 GiB 750.02 GB)
   Raid Devices : 4
  Total Devices : 4
    Persistence : Superblock is persistent

    Update Time : Wed Feb 13 09:20:54 2013
          State : clean, degraded, recovering
 Active Devices : 3
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 1

         Layout : near=2
     Chunk Size : 128K

 Rebuild Status : 14% complete

           Name : mrak.dex.internal:0  (local to host mrak.dex.internal)
           UUID : d3f800db:26de8691:dc0caf45:0f75028b
         Events : 151

    Number   Major   Minor   RaidDevice State
       0       8       16        0      active sync   /dev/sdb
       1       8       64        1      active sync   /dev/sde
       2       8       48        2      active sync   /dev/sdd
       4       8       33        3      spare rebuilding   /dev/sdc1
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closed as too localized by poige, Ladadadada, dunxd, Ward, longneck May 1 '13 at 16:46

This question is unlikely to help any future visitors; it is only relevant to a small geographic area, a specific moment in time, or an extraordinarily narrow situation that is not generally applicable to the worldwide audience of the internet. For help making this question more broadly applicable, visit the help center.If this question can be reworded to fit the rules in the help center, please edit the question.

    
Can you show mdadm --examine --scan -vvvv command output ? –  pdaukintis Feb 27 '13 at 21:04
    
I can't - destroyed the array and made it again, so the mystery array disappeared. :) –  DejanLekic Mar 27 '13 at 13:27
    
I vote for close hence. –  poige May 1 '13 at 5:08

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