Disk mount x86 in Linux LVM HELP

Question

So I have a readynas ultra 2 with 2 TB drives that got that whole "Missing shares error" thing.
So I thought that I would take one of the drives, mount it in linux (ive done this b4), and reset the other drive to copy the data.
But it looks like the data partition is missing the superblock and wont mount correctly.

Any ideas? Or a way to force mount the data partition just to copy the data?

knoppix@Microknoppix:~$ sudo su
root@Microknoppix:/home/knoppix# apt-get install mdadm lvm2
Reading package lists... Done
Building dependency tree       
Reading state information... Done
lvm2 is already the newest version.
mdadm is already the newest version.
0 upgraded, 0 newly installed, 0 to remove and 551 not upgraded.
root@Microknoppix:/home/knoppix# mdadm --assemble --scan
mdadm: /dev/md/1 has been started with 1 drive (out of 2).
mdadm: /dev/md/0 has been started with 1 drive (out of 2).
root@Microknoppix:/home/knoppix# modprobe dm-mod
root@Microknoppix:/home/knoppix# vgscan
  Reading all physical volumes.  This may take a while...
  No volume groups found
root@Microknoppix:/home/knoppix# cat /proc/mdstat
Personalities : [raid1] 
md0 : active raid1 sdc1[2]
      4193268 blocks super 1.2 [2/1] [U_]
      
md1 : active raid1 sdc2[2]
      524276 blocks super 1.2 [2/1] [U_]
      
unused devices: <none>
root@Microknoppix:/home/knoppix# mdadm -v --assemble --auto=yes /dev/md2 /dev/sdc3
mdadm: looking for devices for /dev/md2
mdadm: no recogniseable superblock on /dev/sdc3
mdadm: /dev/sdc3 has no superblock - assembly aborted
root@Microknoppix:/home/knoppix# dumpe2fs /dev/md0 | grep -i superblock
dumpe2fs 1.42.4 (12-Jun-2012)
  Primary superblock at 0, Group descriptors at 1-1
  Backup superblock at 32768, Group descriptors at 32769-32769
  Backup superblock at 98304, Group descriptors at 98305-98305
  Backup superblock at 163840, Group descriptors at 163841-163841
  Backup superblock at 229376, Group descriptors at 229377-229377
  Backup superblock at 294912, Group descriptors at 294913-294913
  Backup superblock at 819200, Group descriptors at 819201-819201
  Backup superblock at 884736, Group descriptors at 884737-884737
root@Microknoppix:/home/knoppix#

Retired_Member · Answer

BumpAny recommendations for a Linux forum I could get  help from?

siigna · Answer

Looks like you're indeed missing the superblock on that disk. I'll imagine it'll output about the same as your assemble command, but what do you get from 'mdadm -E /dev/sdc3' ?

You can force a recreation of the superblock, but I wouldn't do this unless you're absolutely sure of what you're doing. You'll need to get the array itself as well as the logical volume up before you can mount the filesystem.

You can mount /dev/md0 as a regular ext2/3 filesystem (because that's what it is) and you should be able to pull the RAID configuration logs out of /var/log/frontview. If you can post the latest "raid_config_*.log" that contains md2 that would be helpful.

Retired_Member · Answer

Please ignore the mount device name. These were during different logins. sda, sdb, and sdc from the first post are all the first drive from the array.

mdadm -E output for all partitions:

root@Microknoppix:/home/knoppix# mdadm -E /dev/sdb
/dev/sdb:
   MBR Magic : aa55
Partition[0] :   3907029167 sectors at            1 (type ee)
root@Microknoppix:/home/knoppix# mdadm -E /dev/sdb3
mdadm: No md superblock detected on /dev/sdb3.
root@Microknoppix:/home/knoppix# mdadm -E /dev/sdb1
/dev/sdb1:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 494a7e99:7972ebcc:9b4a1bd1:d55a1de3
           Name : E091F58AD8E4:0
  Creation Time : Thu Sep  8 16:33:41 2011
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 8386560 (4.00 GiB 4.29 GB)
     Array Size : 4193268 (4.00 GiB 4.29 GB)
  Used Dev Size : 8386536 (4.00 GiB 4.29 GB)
    Data Offset : 2048 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : 57b9a1e6:9daba6b6:7246f828:f2af845a

    Update Time : Tue Jul  2 01:31:50 2013
       Checksum : 2bcb3495 - correct
         Events : 476276


   Device Role : Active device 0
   Array State : A. ('A' == active, '.' == missing)
root@Microknoppix:/home/knoppix# mdadm -E /dev/sdb2
/dev/sdb2:
          Magic : a92b4efc
        Version : 1.2
    Feature Map : 0x0
     Array UUID : 16b0093f:e9ce8e55:6f550c64:9f57fbf3
           Name : E091F58AD8E4:1
  Creation Time : Thu Sep  8 16:33:42 2011
     Raid Level : raid1
   Raid Devices : 2

 Avail Dev Size : 1048552 (512.07 MiB 536.86 MB)
     Array Size : 524276 (512.07 MiB 536.86 MB)
    Data Offset : 24 sectors
   Super Offset : 8 sectors
          State : clean
    Device UUID : cdbaf0c1:7d3f99a3:37786b19:3f1e936a

    Update Time : Thu Jun 27 21:49:16 2013
       Checksum : c59f7e50 - correct
         Events : 255


   Device Role : Active device 0
   Array State : A. ('A' == active, '.' == missing)
root@Microknoppix:/home/knoppix#

Important:

root@Microknoppix:/home/knoppix# mdadm -E /dev/sdb3
mdadm: No md superblock detected on /dev/sdb3.

gdisk output:

root@ubuntu:/home/ubuntu# gdisk
GPT fdisk (gdisk) version 0.8.1

Type device filename, or press <Enter> to exit: /dev/sda
Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): p
Disk /dev/sda: 3907029168 sectors, 1.8 TiB
Logical sector size: 512 bytes
Disk identifier (GUID): D2AD91F6-ED10-451B-8466-36F3A01BFE2D
Partition table holds up to 128 entries
First usable sector is 34, last usable sector is 3907029134
Partitions will be aligned on 64-sector boundaries
Total free space is 4092 sectors (2.0 MiB)

Number  Start (sector)    End (sector)  Size       Code  Name
   1              64         8388671   4.0 GiB     FD00  
   2         8388672         9437247   512.0 MiB   FD00  
   3         9437248      3907025072   1.8 TiB     FD00  

Command (? for help): i   
Partition number (1-3): 1
Partition GUID code: A19D880F-05FC-4D3B-A006-743F0F84911E (Linux RAID)
Partition unique GUID: 29CFC302-D112-423D-BA26-B50B9F733F25
First sector: 64 (at 32.0 KiB)
Last sector: 8388671 (at 4.0 GiB)
Partition size: 8388608 sectors (4.0 GiB)
Attribute flags: 0000000000000000
Partition name: ''

Command (? for help): i
Partition number (1-3): 2
Partition GUID code: A19D880F-05FC-4D3B-A006-743F0F84911E (Linux RAID)
Partition unique GUID: B3B52523-2065-46AC-8D71-C802C2FBD618
First sector: 8388672 (at 4.0 GiB)
Last sector: 9437247 (at 4.5 GiB)
Partition size: 1048576 sectors (512.0 MiB)
Attribute flags: 0000000000000000
Partition name: ''

Command (? for help): i
Partition number (1-3): 3
Partition GUID code: A19D880F-05FC-4D3B-A006-743F0F84911E (Linux RAID)
Partition unique GUID: 08A311D3-C961-4449-9CB1-B0BD32D9B39D
First sector: 9437248 (at 4.5 GiB)
Last sector: 3907025072 (at 1.8 TiB)
Partition size: 3897587825 sectors (1.8 TiB)
Attribute flags: 0000000000000000
Partition name: ''

Ill get the logs when i can.
As far as I can tell, I had power loss during a resync of the drives, so now I have a bad sector and the second drive is stuck as a spare.

Retired_Member · Answer

Last good configuration:***** RAID configuration log from 2013/05/26 ********** mdadm -D --scan -v *****ARRAY /dev/md/0 level=raid1 num-devices=2 metadata=1.2 name=E091F58AD8E4:0 UUID=494a7e99:7972ebcc:9b4a1bd1:d55a1de3   devices=/dev/sda1,/dev/sdb1ARRAY /dev/md/1 level=raid1 num-devices=2 metadata=1.2 name=E091F58AD8E4:1 UUID=16b0093f:e9ce8e55:6f550c64:9f57fbf3   devices=/dev/sda2,/dev/sdb2ARRAY /dev/md/2 level=raid5 num-devices=2 metadata=1.2 name=E091F58AD8E4:2 UUID=1c784278:8cb4a7bc:b66b10e9:3c012e64   devices=/dev/sda3,/dev/sdb3***** mdadm -D --scan -vv *****/dev/md/0:        Version : 1.2  Creation Time : Thu Sep  8 12:33:41 2011     Raid Level : raid1     Array Size : 4193268 (4.00 GiB 4.29 GB)  Used Dev Size : 4193268 (4.00 GiB 4.29 GB)   Raid Devices : 2  Total Devices : 2    Persistence : Superblock is persistent    Update Time : Sun May 26 06:47:01 2013          State : clean Active Devices : 2Working Devices : 2 Failed Devices : 0  Spare Devices : 0           Name : E091F58AD8E4:0           UUID : 494a7e99:7972ebcc:9b4a1bd1:d55a1de3         Events : 369632    Number   Major   Minor   RaidDevice State       2       8        1        0      active sync   /dev/sda1       1       8       17        1      active sync   /dev/sdb1/dev/md/1:        Version : 1.2  Creation Time : Thu Sep  8 12:33:42 2011     Raid Level : raid1     Array Size : 524276 (512.07 MiB 536.86 MB)  Used Dev Size : 524276 (512.07 MiB 536.86 MB)   Raid Devices : 2  Total Devices : 2    Persistence : Superblock is persistent    Update Time : Sun May 26 06:47:01 2013          State : clean Active Devices : 2Working Devices : 2 Failed Devices : 0  Spare Devices : 0           Name : E091F58AD8E4:1           UUID : 16b0093f:e9ce8e55:6f550c64:9f57fbf3         Events : 213    Number   Major   Minor   RaidDevice State       2       8        2        0      active sync   /dev/sda2       1       8       18        1      active sync   /dev/sdb2/dev/md/2:        Version : 1.2  Creation Time : Thu Sep  8 12:33:42 2011     Raid Level : raid5     Array Size : 1948792704 (1858.51 GiB 1995.56 GB)  Used Dev Size : 1948792704 (1858.51 GiB 1995.56 GB)   Raid Devices : 2  Total Devices : 2    Persistence : Superblock is persistent    Update Time : Sun May 26 06:47:01 2013          State : clean Active Devices : 2Working Devices : 2 Failed Devices : 0  Spare Devices : 0         Layout : left-symmetric     Chunk Size : 64K           Name : E091F58AD8E4:2           UUID : 1c784278:8cb4a7bc:b66b10e9:3c012e64         Events : 5399    Number   Major   Minor   RaidDevice State       0       8        3        0      active sync   /dev/sda3       1       8       19        1      active sync   /dev/sdb3***** mdconfig *****Device         : /dev/md0Create Time    : 1315499621Update Time    : 1369565221RAID Level     : 1RAID Capacity  : 4193268Disk Size      : 4193268Chunk Size     : 0Disks          : 2RAID Disks     : 2Active Disks   : 2Working Disks  : 2Failed Disks   : 0Spare Disks    : 0State          : 1 [ Clean ]Disk  Device         RAID Disk  Maj/Min     Sectors   State---------------------------------------------------------------------------  1   /dev/sdb1          1        8/17      8388608    6 [ Active Sync ]  2   /dev/sda1          0        8/ 1      8388608    6 [ Active Sync ]Device         : /dev/md1Create Time    : 1315499622Update Time    : 1369565221RAID Level     : 1RAID Capacity  : 524276Disk Size      : 524276Chunk Size     : 0Disks          : 2RAID Disks     : 2Active Disks   : 2Working Disks  : 2Failed Disks   : 0Spare Disks    : 0State          : 1 [ Clean ]Disk  Device         RAID Disk  Maj/Min     Sectors   State---------------------------------------------------------------------------  1   /dev/sdb2          1        8/18      1048576    6 [ Active Sync ]  2   /dev/sda2          0        8/ 2      1048576    6 [ Active Sync ]Device         : /dev/md2Create Time    : 1315499622Update Time    : 1369565221RAID Level     : 5RAID Capacity  : 1948792704Disk Size      : 1948792704Chunk Size     : 65536Disks          : 2RAID Disks     : 2Active Disks   : 2Working Disks  : 2Failed Disks   : 0Spare Disks    : 0State          : 1 [ Clean ]Disk  Device         RAID Disk  Maj/Min     Sectors   State---------------------------------------------------------------------------  0   /dev/sda3          0        8/ 3   3897587825    6 [ Active Sync ]  1   /dev/sdb3          1        8/19   3897587825    6 [ Active Sync ]After failure:***** RAID configuration log from 2013/06/02 ********** mdadm -D --scan -v *****ARRAY /dev/md/0 level=raid1 num-devices=2 metadata=1.2 name=E091F58AD8E4:0 UUID=494a7e99:7972ebcc:9b4a1bd1:d55a1de3   devices=/dev/sda1,/dev/sdb1ARRAY /dev/md/1 level=raid1 num-devices=2 metadata=1.2 name=E091F58AD8E4:1 UUID=16b0093f:e9ce8e55:6f550c64:9f57fbf3   devices=/dev/sda2,/dev/sdb2ARRAY /dev/md/2 level=raid5 num-devices=2 metadata=1.2 name=E091F58AD8E4:2 UUID=1c784278:8cb4a7bc:b66b10e9:3c012e64   devices=/dev/sda3,/dev/sdb3***** mdadm -D --scan -vv *****/dev/md/0:        Version : 1.2  Creation Time : Thu Sep  8 12:33:41 2011     Raid Level : raid1     Array Size : 4193268 (4.00 GiB 4.29 GB)  Used Dev Size : 4193268 (4.00 GiB 4.29 GB)   Raid Devices : 2  Total Devices : 2    Persistence : Superblock is persistent    Update Time : Sun Jun  2 06:47:01 2013          State : clean, degraded Active Devices : 1Working Devices : 1 Failed Devices : 1  Spare Devices : 0           Name : E091F58AD8E4:0           UUID : 494a7e99:7972ebcc:9b4a1bd1:d55a1de3         Events : 369975    Number   Major   Minor   RaidDevice State       2       8        1        0      active sync   /dev/sda1       1       0        0        1      removed       1       8       17        -      faulty spare   /dev/sdb1/dev/md/1:        Version : 1.2  Creation Time : Thu Sep  8 12:33:42 2011     Raid Level : raid1     Array Size : 524276 (512.07 MiB 536.86 MB)  Used Dev Size : 524276 (512.07 MiB 536.86 MB)   Raid Devices : 2  Total Devices : 2    Persistence : Superblock is persistent    Update Time : Sun Jun  2 06:47:02 2013          State : clean, degraded Active Devices : 1Working Devices : 1 Failed Devices : 1  Spare Devices : 0           Name : E091F58AD8E4:1           UUID : 16b0093f:e9ce8e55:6f550c64:9f57fbf3         Events : 216    Number   Major   Minor   RaidDevice State       2       8        2        0      active sync   /dev/sda2       1       0        0        1      removed       1       8       18        -      faulty spare   /dev/sdb2/dev/md/2:        Version : 1.2  Creation Time : Thu Sep  8 12:33:42 2011     Raid Level : raid5     Array Size : 1948792704 (1858.51 GiB 1995.56 GB)  Used Dev Size : 1948792704 (1858.51 GiB 1995.56 GB)   Raid Devices : 2  Total Devices : 2    Persistence : Superblock is persistent    Update Time : Sun Jun  2 06:47:02 2013          State : clean, degraded Active Devices : 1Working Devices : 1 Failed Devices : 1  Spare Devices : 0         Layout : left-symmetric     Chunk Size : 64K           Name : E091F58AD8E4:2           UUID : 1c784278:8cb4a7bc:b66b10e9:3c012e64         Events : 5402    Number   Major   Minor   RaidDevice State       0       8        3        0      active sync   /dev/sda3       1       0        0        1      removed       1       8       19        -      faulty spare   /dev/sdb3***** mdconfig *****Device         : /dev/md0Create Time    : 1315499621Update Time    : 1370170022RAID Level     : 1RAID Capacity  : 4193268Disk Size      : 4193268Chunk Size     : 0Disks          : 2RAID Disks     : 2Active Disks   : 1Working Disks  : 1Failed Disks   : 1Spare Disks    : 0State          : 1 [ Clean ]Disk  Device         RAID Disk  Maj/Min     Sectors   State---------------------------------------------------------------------------  1   /dev/sdb1         -1        8/17      8388608    1 [ Faulty ]  2   /dev/sda1          0        8/ 1      8388608    6 [ Active Sync ]Device         : /dev/md1Create Time    : 1315499622Update Time    : 1370170022RAID Level     : 1RAID Capacity  : 524276Disk Size      : 524276Chunk Size     : 0Disks          : 2RAID Disks     : 2Active Disks   : 1Working Disks  : 1Failed Disks   : 1Spare Disks    : 0State          : 1 [ Clean ]Disk  Device         RAID Disk  Maj/Min     Sectors   State---------------------------------------------------------------------------  1   /dev/sdb2         -1        8/18      1048576    1 [ Faulty ]  2   /dev/sda2          0        8/ 2      1048576    6 [ Active Sync ]Device         : /dev/md2Create Time    : 1315499622Update Time    : 1370170022RAID Level     : 5RAID Capacity  : 1948792704Disk Size      : 1948792704Chunk Size     : 65536Disks          : 2RAID Disks     : 2Active Disks   : 1Working Disks  : 1Failed Disks   : 1Spare Disks    : 0State          : 1 [ Clean ]Disk  Device         RAID Disk  Maj/Min     Sectors   State---------------------------------------------------------------------------  0   /dev/sda3          0        8/ 3   3897587825    6 [ Active Sync ]  1   /dev/sdb3         -1        8/19   3897587825    1 [ Faulty ]Im beginning to think the LVM is the problem not the superblock. How do you recover LVM partition data?

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Disk mount x86 in Linux LVM HELP

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