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Lost Raid after reboot
#1
Hi,

I recently bought a NAS Thecus N7510. I also bought 2x2To disks and create a Raid 1 in order to backup my data contained in an "old" 2To disk

When data transfert was done I tried to migrate from my Raid 1 to a Raid 5 by adding my "old" 2To disk. First Raid construction failed because my old disk contained bad blocks (It was marked as an X on the LCD). My raid was on a degraded state. So I run a SMART bad blocks detection. Once the detections was done I retry adding the disk to the Raid 5. This time the Raid migration run fine (with 3 disks marked as O on the LCD).

So I restarted my NAS and, after rebooting, my Raid setup was gone (Raid: None on LCD screen and no Raid on web management console)...

So I enabled ssh connection to try to see if mdadm tool is able to find my data from disks:

Code:
N7510:~# mdadm --examine /dev/sda1
/dev/sda1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8491f2fd:6989ac30:a7b46879:88cc26f3
           Name : N7510:10  (local to host N7510)
  Creation Time : Sat Sep 13 14:48:46 2014
     Raid Level : raid1
   Raid Devices : 7

Avail Dev Size : 4192256 (2047.34 MiB 2146.44 MB)
     Array Size : 4192232 (2047.33 MiB 2146.42 MB)
  Used Dev Size : 4192232 (2047.33 MiB 2146.42 MB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 16b9ea37:0d198bc2:270588f9:4ff31433

    Update Time : Sun Sep 28 14:42:30 2014
       Checksum : 74d58a34 - correct
         Events : 76509


   Device Role : Active device 0
   Array State : AAAA... ('A' == active, '.' == missing)
  
N7510:~# mdadm --examine /dev/sda2
/dev/sda2:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8a971ec9:87cdff66:6099843c:84697be5
           Name : N7510:0  (local to host N7510)
  Creation Time : Sat Sep 13 14:48:46 2014
     Raid Level : raid5
   Raid Devices : 3

Avail Dev Size : 3901747200 (1860.50 GiB 1997.69 GB)
     Array Size : 7803494400 (3721.00 GiB 3995.39 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : c7cabe9a:88f9533e:85d7b311:04a7d945

    Update Time : Sun Sep 28 13:00:56 2014
       Checksum : a7001bef - correct
         Events : 213295

         Layout : left-symmetric
     Chunk Size : 64K

   Device Role : Active device 0
   Array State : AAA ('A' == active, '.' == missing)
  
N7510:~# mdadm --examine /dev/sdb1
/dev/sdb1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8491f2fd:6989ac30:a7b46879:88cc26f3
           Name : N7510:10  (local to host N7510)
  Creation Time : Sat Sep 13 14:48:46 2014
     Raid Level : raid1
   Raid Devices : 7

Avail Dev Size : 4192256 (2047.34 MiB 2146.44 MB)
     Array Size : 4192232 (2047.33 MiB 2146.42 MB)
  Used Dev Size : 4192232 (2047.33 MiB 2146.42 MB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 636a4e8b:5018730a:29073a3c:94db8542

    Update Time : Sun Sep 28 14:42:30 2014
       Checksum : 6244250b - correct
         Events : 76509


   Device Role : Active device 1
   Array State : AAAA... ('A' == active, '.' == missing)

N7510:~# mdadm --examine /dev/sdb2
/dev/sdb2:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8a971ec9:87cdff66:6099843c:84697be5
           Name : N7510:0  (local to host N7510)
  Creation Time : Sat Sep 13 14:48:46 2014
     Raid Level : raid5
   Raid Devices : 3

Avail Dev Size : 3901747200 (1860.50 GiB 1997.69 GB)
     Array Size : 7803494400 (3721.00 GiB 3995.39 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 7da567d7:450c8a2b:4fab7515:7aab0879

    Update Time : Sun Sep 28 13:00:56 2014
       Checksum : 7cfe1a4 - correct
         Events : 213295

         Layout : left-symmetric
     Chunk Size : 64K

   Device Role : Active device 1
   Array State : AAA ('A' == active, '.' == missing)

N7510:~# mdadm --examine /dev/sdc1
/dev/sdc1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8491f2fd:6989ac30:a7b46879:88cc26f3
           Name : N7510:10  (local to host N7510)
  Creation Time : Sat Sep 13 14:48:46 2014
     Raid Level : raid1
   Raid Devices : 7

Avail Dev Size : 4192256 (2047.34 MiB 2146.44 MB)
     Array Size : 4192232 (2047.33 MiB 2146.42 MB)
  Used Dev Size : 4192232 (2047.33 MiB 2146.42 MB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 7ba3d000:c329de78:7bb4bc42:da35320b

    Update Time : Sun Sep 28 14:42:30 2014
       Checksum : 15607734 - correct
         Events : 76509


   Device Role : Active device 2
   Array State : AAAA... ('A' == active, '.' == missing)
  
N7510:~# mdadm --examine /dev/sdc2
/dev/sdc2:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 8a971ec9:87cdff66:6099843c:84697be5
           Name : N7510:0  (local to host N7510)
  Creation Time : Sat Sep 13 14:48:46 2014
     Raid Level : raid5
   Raid Devices : 3

Avail Dev Size : 3901747200 (1860.50 GiB 1997.69 GB)
     Array Size : 7803494400 (3721.00 GiB 3995.39 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : bea97d67:7672e815:57c5701b:46179a14

    Update Time : Sun Sep 28 13:00:56 2014
       Checksum : 23d0d1eb - correct
         Events : 213295

         Layout : left-symmetric
     Chunk Size : 64K

   Device Role : Active device 2
   Array State : AAA ('A' == active, '.' == missing)

As Raid setup was recognized I tried to automatically build raid devices

Code:
N7510:~# mdadm --assemble --scan
mdadm: /dev/md/50 has been started with 3 drives and 1 spare.
mdadm: /dev/md/10 has been started with 4 drives (out of 7).
mdadm: /dev/md/0 has been started with 3 drives.

Then I tried to mount the newly created device in order to see my data

Code:
N7510:~# mount /dev/md0 /tmp/RAID/
N7510:~# df -h
Filesystem                Size      Used Available Use% Mounted on
/dev/root               124.0M     51.4M     72.5M  42% /
tmpfs                   980.4M     90.3M    890.1M   9% /dev/shm
tmpfs                   980.4M     90.3M    890.1M   9% /var
/dev/loop0              802.2M    449.0M    353.2M  56% /rom
/dev/loop1                7.5M      7.5M         0 100% /img
/dev/loop2                8.6M      8.6M         0 100% /usr/lib64
/dev/loop3              256.0K    256.0K         0 100% /usr/share/zoneinfo
/dev/loop4               66.6M     66.6M         0 100% /opt
/dev/sdaaa4              22.9M    343.0K     22.5M   1% /syslog
/dev/sdaaa2              22.9M    861.0K     22.0M   4% /etc
/dev/md0                  1.8T      1.5T    345.9G  81% /var/tmp/RAID

Then my data was accessible throught /tmp/RAID/data. But when I logged on the web interface the "recovered" Raid didn't show up correctly :

[Image: raid.jpg]

Does someone has an idea on :
- why did only 1.8T shown up as there are 3x2To disks ?
- how to manualy append my recovered Raid to the web interface console ?

In advance, thanks a lot.
Reply
#2
Hi Popof,

Would you please submit a support ticket to Thecus staff at <!-- m --><a class="postlink" href="http://esupport.thecus.com/support/">http://esupport.thecus.com/support/</a><!-- m -->

Best,
John, Oct 6 '14
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