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Thread: mdadm troubles - no superblock on md0 but array assembles

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    Join Date
    Jul 2010
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    mdadm troubles - no superblock on md0 but array assembles

    Hi All, I'm having a bit of a time with MDADM. Basically I have a RAID6 system setup w/ 10 hard drives (1.5GB). Last night I had a failed drive and i accidentally failed out the wrong drive trying to fix it. Right now I can get the array to assemble successfully but I cant read anything off of md0, it can't mount either. Here is the output of a few command:

    mdadm --examine /dev/md0
    Code:
     
    mdadm: No md superblock detected on /dev/md0.
    # mdadm --assemble --scan -v
    Code:
    mdadm: looking for devices for /dev/md0
    mdadm: /dev/sdj1 is not one of /dev/sdb1,/dev/sdc1,/dev/sdd1,/dev/sde1,/dev/sdf1,/dev/sdg1,/dev/sdh1,/dev/sdi1,dev/sdj1,/dev/sdk1
    mdadm: /dev/sdk1 is identified as a member of /dev/md0, slot 9.
    mdadm: /dev/sdi1 is identified as a member of /dev/md0, slot 7.
    mdadm: /dev/sdh1 is identified as a member of /dev/md0, slot 6.
    mdadm: /dev/sdg1 is identified as a member of /dev/md0, slot 5.
    mdadm: /dev/sdf1 is identified as a member of /dev/md0, slot 4.
    mdadm: /dev/sde1 is identified as a member of /dev/md0, slot 3.
    mdadm: /dev/sdd1 is identified as a member of /dev/md0, slot 2.
    mdadm: /dev/sdc1 is identified as a member of /dev/md0, slot 1.
    mdadm: /dev/sdb1 is identified as a member of /dev/md0, slot 0.
    mdadm: added /dev/sdc1 to /dev/md0 as 1
    mdadm: added /dev/sdd1 to /dev/md0 as 2
    mdadm: added /dev/sde1 to /dev/md0 as 3
    mdadm: added /dev/sdf1 to /dev/md0 as 4
    mdadm: added /dev/sdg1 to /dev/md0 as 5
    mdadm: added /dev/sdh1 to /dev/md0 as 6
    mdadm: added /dev/sdi1 to /dev/md0 as 7
    mdadm: no uptodate device for slot 8 of /dev/md0
    mdadm: added /dev/sdk1 to /dev/md0 as 9
    mdadm: added /dev/sdb1 to /dev/md0 as 0
    mdadm: /dev/md0 has been started with 9 drives (out of 10).
    # mdadm --detail /dev/md0
    Code:
    /dev/md0:
            Version : 1.2
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 1464466432 (1396.62 GiB 1499.61 GB)
       Raid Devices : 10
      Total Devices : 9
        Persistence : Superblock is persistent
    
    
        Update Time : Sat Mar  2 19:06:59 2013
              State : clean, degraded 
     Active Devices : 9
    Working Devices : 9
     Failed Devices : 0
      Spare Devices : 0
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
               Name : AR-NAS:0  (local to host AR-NAS)
               UUID : 267d0d47:387d7113:fe31ac5c:9add924e
             Events : 0
    
    
        Number   Major   Minor   RaidDevice State
           0       8       17        0      active sync   /dev/sdb1
           1       8       33        1      active sync   /dev/sdc1
           2       8       49        2      active sync   /dev/sdd1
           3       8       65        3      active sync   /dev/sde1
           4       8       81        4      active sync   /dev/sdf1
           5       8       97        5      active sync   /dev/sdg1
           6       8      113        6      active sync   /dev/sdh1
           7       8      129        7      active sync   /dev/sdi1
           8       0        0        8      removed
           9       8      161        9      active sync   /dev/sdk1
    fdisk -l /dev/md0
    Code:
    Disk /dev/md0: 11998.0 GB, 11997982752768 bytes
    2 heads, 4 sectors/track, -1365772288 cylinders, total 23433560064 sectors
    Units = sectors of 1 * 512 = 512 bytes
    Sector size (logical/physical): 512 bytes / 4096 bytes
    I/O size (minimum/optimal): 1048576 bytes / 8388608 bytes
    # mdadm --examine /dev/sd[bcdefghijk]1
    Code:
    /dev/sdb1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2928934878 (1396.63 GiB 1499.61 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : d4dc6bbc:50da526b:4cb3d499:55a5a6b7
    
    
        Update Time : Sat Mar  2 20:27:21 2013
           Checksum : 4dadf65e - correct
             Events : 2
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 0
       Array State : AAAAAAAA.A ('A' == active, '.' == missing)
    /dev/sdc1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2928934878 (1396.63 GiB 1499.61 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : f2747d0c:1310f714:d4a076a8:0fc2741e
    
    
        Update Time : Sat Mar  2 20:27:21 2013
           Checksum : bcd3ce80 - correct
             Events : 2
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 1
       Array State : AAAAAAAA.A ('A' == active, '.' == missing)
    
    /dev/sdd1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2928934878 (1396.63 GiB 1499.61 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : 354ad7b0:93b718cb:e0147b71:35ac114a
    
    
        Update Time : Sat Mar  2 20:27:21 2013
           Checksum : bf0a978 - correct
             Events : 2
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 2
       Array State : AAAAAAAA.A ('A' == active, '.' == missing)
    /dev/sde1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2930012160 (1397.14 GiB 1500.17 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : 5c01ec81:233e0df7:50e30601:751d142e
    
    
        Update Time : Sat Mar  2 20:27:21 2013
           Checksum : 7c989701 - correct
             Events : 2
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 3
       Array State : AAAAAAAA.A ('A' == active, '.' == missing)
    
    /dev/sdf1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2928934878 (1396.63 GiB 1499.61 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : 80fe6eea:78c2f69b:d5321b3d:a22507c0
    
    
        Update Time : Sat Mar  2 20:27:21 2013
           Checksum : 57fc000c - correct
             Events : 2
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 4
       Array State : AAAAAAAA.A ('A' == active, '.' == missing)
    /dev/sdg1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2928934845 (1396.62 GiB 1499.61 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : 3b7cc21a:5d692236:cabb08cc:0f432714
    
    
        Update Time : Sat Mar  2 20:27:21 2013
           Checksum : 588caed - correct
             Events : 2
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 5
       Array State : AAAAAAAA.A ('A' == active, '.' == missing)
    
    /dev/sdh1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2928934845 (1396.62 GiB 1499.61 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : d0ec6626:9a77353c:a2e24a9c:bd156c3c
    
    
        Update Time : Sat Mar  2 20:27:21 2013
           Checksum : fc74346 - correct
             Events : 2
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 6
       Array State : AAAAAAAA.A ('A' == active, '.' == missing)
    /dev/sdi1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2928933532 (1396.62 GiB 1499.61 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : 65494853:b588c0fa:9a78190f:83f67a32
    
    
        Update Time : Sat Mar  2 20:27:21 2013
           Checksum : 64112294 - correct
             Events : 2
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 7
       Array State : AAAAAAAA.A ('A' == active, '.' == missing)
    
    /dev/sdj1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2928934810 (1396.62 GiB 1499.61 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : 630c017e:7de28e7f:5aca24e5:8e684bdc
    
    
        Update Time : Sat Mar  2 19:06:59 2013
           Checksum : 93adf592 - correct
             Events : 0
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 8
       Array State : AAAAAAAAAA ('A' == active, '.' == missing)
    /dev/sdk1:
              Magic : a92b4efc
            Version : 1.2
        Feature Map : 0x0
         Array UUID : 267d0d47:387d7113:fe31ac5c:9add924e
               Name : AR-NAS:0  (local to host AR-NAS)
      Creation Time : Sat Mar  2 19:06:59 2013
         Raid Level : raid6
       Raid Devices : 10
    
    
     Avail Dev Size : 2928934844 (1396.62 GiB 1499.61 GB)
         Array Size : 11715731456 (11172.99 GiB 11996.91 GB)
      Used Dev Size : 2928932864 (1396.62 GiB 1499.61 GB)
        Data Offset : 262144 sectors
       Super Offset : 8 sectors
              State : clean
        Device UUID : 1b00c2c5:07423417:ad2f68dc:58decccf
    
    
        Update Time : Sat Mar  2 20:27:21 2013
           Checksum : 5d9f36a7 - correct
             Events : 2
    
    
             Layout : left-symmetric
         Chunk Size : 512K
    
    
       Device Role : Active device 9
       Array State : AAAAAAAA.A ('A' == active, '.' == missing)
    # cat /proc/mdstat
    Code:
    Personalities : [raid6] [raid5] [raid4] 
    md0 : active raid6 sdb1[0] sdk1[9] sdi1[7] sdh1[6] sdg1[5] sdf1[4] sde1[3] sdd1[2] sdc1[1]
          11715731456 blocks super 1.2 level 6, 512k chunk, algorithm 2 [10/9] [UUUUUUUU_U]
          
    unused devices: <none>
    I figure I need some serious help by you guys any help with this would be greatly appreciated. I really hope I can get my photos back, got some family pictures I have not done a recent backup of yet

    Thanks all!
    Last edited by Silicon Knight; March 3rd, 2013 at 02:45 AM.

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