Hi,

I am having a problem with my RAID array. After going on vacation for a couple of weeks I have come back unable to access any of the data. I would appreciate it if anybody can help as i don't want to loose my data by rebuiling the array incorrectly.
I am not sure why the problem happened and help in understanding why would also be appreciated.

I used to have a ZFS filesystem on 3 of the 5 drives.
After setting up the mdraid i formated the filesystem with btrfs. (I realize this is my next problem if i can get as far as loading up the array). But my hope is to be able to extracted media so i don't have to rerip everything.

The drives should be set up in a RAID-6 setup.

Hope i included the most usefull data

Thanks for reading this far.

René

Code:
$ uname -a
Linux Asgard 3.0.0-16-server #29-Ubuntu SMP Tue Feb 14 13:08:12 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux

Code:
$ sudo mdadm --examine /dev/sd*
mdadm: No md superblock detected on /dev/sda.
mdadm: No md superblock detected on /dev/sda1.
mdadm: No md superblock detected on /dev/sda2.
mdadm: No md superblock detected on /dev/sda5.
/dev/sdb:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 0db0c336:f56bd888:2f9e92e4:c1d64c09
           Name : Asgard:0  (local to host Asgard)
  Creation Time : Sat Jan 28 14:29:36 2012
     Raid Level : raid6
   Raid Devices : 5

 Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB)
     Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
  Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 8e861931:6f7448ec:6f2c6cd2:74cb06a2

    Update Time : Tue Mar 27 18:25:33 2012
       Checksum : a4305a9b - correct
         Events : 315451

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : Active device 4
   Array State : ..A.A ('A' == active, '.' == missing)
/dev/sdc:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 0db0c336:f56bd888:2f9e92e4:c1d64c09
           Name : Asgard:0  (local to host Asgard)
  Creation Time : Sat Jan 28 14:29:36 2012
     Raid Level : raid6
   Raid Devices : 5

 Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB)
     Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
  Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : ef9d6881:b31e81b4:9403e07a:4280392d

    Update Time : Tue Mar 27 18:25:33 2012
       Checksum : f05ad7f8 - correct
         Events : 0

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : spare
   Array State : ..A.A ('A' == active, '.' == missing)
/dev/sdd:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 0db0c336:f56bd888:2f9e92e4:c1d64c09
           Name : Asgard:0  (local to host Asgard)
  Creation Time : Sat Jan 28 14:29:36 2012
     Raid Level : raid6
   Raid Devices : 5

 Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB)
     Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
  Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 387de195:c966497f:f7fad598:cfc7fb10

    Update Time : Tue Mar 27 18:25:33 2012
       Checksum : d1543e47 - correct
         Events : 0

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : spare
   Array State : ..A.A ('A' == active, '.' == missing)
/dev/sde:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 0db0c336:f56bd888:2f9e92e4:c1d64c09
           Name : Asgard:0  (local to host Asgard)
  Creation Time : Sat Jan 28 14:29:36 2012
     Raid Level : raid6
   Raid Devices : 5

 Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB)
     Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
  Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 8e1a4400:e00d30d2:faf68bb0:99e13cb1

    Update Time : Tue Mar 27 18:25:33 2012
       Checksum : 46949882 - correct
         Events : 0

         Layout : left-symmetric
     Chunk Size : 512K

   Device Role : spare
   Array State : ..A.A ('A' == active, '.' == missing)
/dev/sdf:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 0db0c336:f56bd888:2f9e92e4:c1d64c09
           Name : Asgard:0  (local to host Asgard)
  Creation Time : Sat Jan 28 14:29:36 2012
     Raid Level : raid6
   Raid Devices : 5

 Avail Dev Size : 3907027120 (1863.02 GiB 2000.40 GB)
     Array Size : 11721077760 (5589.05 GiB 6001.19 GB)
  Used Dev Size : 3907025920 (1863.02 GiB 2000.40 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 418fe563:d3c6d16b:54762ab7:8b6aced2

    Update Time : Tue Mar 27 18:25:33 2012
       Checksum : 6c0b9ead - correct
         Events : 315451

         Layout : left-symmetric
     Chunk Size : 512K

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

Code:
Output of parted:
# parted -l /dev/sd[bcdef]
Error: The primary GPT table is corrupt, but the backup appears OK, so that will
be used.
OK/Cancel? ok                                                             
Model: ATA ST2000DL003-9VT1 (scsi)
Disk /dev/sdb: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  2000GB  2000GB               zfs
 9      2000GB  2000GB  8389kB


Error: The primary GPT table is corrupt, but the backup appears OK, so that will be used.
OK/Cancel? ok                                                             
Model: ATA ST2000DL003-9VT1 (scsi)
Disk /dev/sdc: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  2000GB  2000GB               zfs
 9      2000GB  2000GB  8389kB


Error: /dev/sdd: unrecognised disk label                                  

Error: /dev/sde: unrecognised disk label                                  

Error: The primary GPT table is corrupt, but the backup appears OK, so that will be used.
OK/Cancel? ok                                                             
Model: ATA ST2000DL003-9VT1 (scsi)
Disk /dev/sdf: 2000GB
Sector size (logical/physical): 512B/512B
Partition Table: gpt

Number  Start   End     Size    File system  Name  Flags
 1      1049kB  2000GB  2000GB               zfs
 9      2000GB  2000GB  8389kB



Build:
Code:
#created a raid 5 array with 3 disks. Don't have the precise commands anymore.
sudo mdadm --add /dev/md127 /dev/sdc /dev/sdd
sudo mdadm --grow --level=6 --raid-devices=5 /dev/md127 --backup-file=/home/renec/raid.backup