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Re: [linux-lvm] Unable to mount LVM partition - table too small



Here is the info requested - it looks like on this particular boot, /dev/sda was mapped for the OS drive and the RAID got mapped to /dev/sd[bcde] - therefore I've dump info for /dev/sd[bcde]. So at least for this boot sequence it looks like the RAID array doesn't align with the device assignment.

In previous emails/logs, the RAID was /dev/sd[abcd] with the OS drive mapped top /dev/sde. To confirm this I redid the fdisk -l & cat /proc/partitions, /proc/mdstat

You are correct, the original array was /dev/sd[abcd] (or now /dev/sd[bcde], with the OS drive on /dev/hda. It looks like Ubuntu maps IDE drives to sd[x]. The 4x1TB drives are SATA, the OS drive is IDE. A single PV/LV/VG LVM sits on top the the 3TB RAID5 with ext3 on top of that should yield 2.7TB of usable data.

I did some Googling and came across this:
http://kevin.deldycke.com/2007/03/how-to-recover-a-raid-array-after-having-zero-ized-superblocks/

The missing superblock error is displayed when dumping /dev/sda which makes sense as this isn't part of the RAID.

In the link above, the author recreated the RAID....however I haven't wanted to do this (or anything else that might get categorized as stupid) without guidance or a dd copy in case I toasted the data.

I also don't remember ever seeing /dev/md0p1 before, just a /dev/md0

root adam-desktop:~# mdadm --examine --scan --verbose
ARRAY /dev/md0 level=raid5 num-devices=4 UUID=b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
   devices=/dev/sde,/dev/sdd,/dev/sdc,/dev/sdb
ARRAY /dev/md0 level=raid5 num-devices=4 UUID=08558923:881d9efd:464c249d:988d2ec6
   devices=/dev/sde1,/dev/sdd1,/dev/sdc1,/dev/sdb1

root adam-desktop:~# mdadm --examine --verbose /dev/sdb
/dev/sdb:
          Magic : a92b4efc
        Version : 00.90.03
           UUID : b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
  Creation Time : Sat Nov  1 22:14:18 2008
     Raid Level : raid5
  Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
     Array Size : 2930287488 (2794.54 GiB 3000.61 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0

    Update Time : Mon Sep 20 19:24:26 2010
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0
       Checksum : e9cec762 - correct
         Events : 68

         Layout : left-symmetric
     Chunk Size : 64K

      Number   Major   Minor   RaidDevice State
this     0       8        0        0      active sync   /dev/sda

   0     0       8        0        0      active sync   /dev/sda
   1     1       8       16        1      active sync   /dev/sdb
   2     2       8       32        2      active sync   /dev/sdc
   3     3       8       48        3      active sync   /dev/sdd
root adam-desktop:~# mdadm --examine --verbose /dev/sdc
/dev/sdc:
          Magic : a92b4efc
        Version : 00.90.03
           UUID : b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
  Creation Time : Sat Nov  1 22:14:18 2008
     Raid Level : raid5
  Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
     Array Size : 2930287488 (2794.54 GiB 3000.61 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0

    Update Time : Mon Sep 20 19:24:26 2010
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0
       Checksum : e9cec774 - correct
         Events : 68

         Layout : left-symmetric
     Chunk Size : 64K

      Number   Major   Minor   RaidDevice State
this     1       8       16        1      active sync   /dev/sdb

   0     0       8        0        0      active sync   /dev/sda
   1     1       8       16        1      active sync   /dev/sdb
   2     2       8       32        2      active sync   /dev/sdc
   3     3       8       48        3      active sync   /dev/sdd
root adam-desktop:~# mdadm --examine --verbose /dev/sdd
/dev/sdd:
          Magic : a92b4efc
        Version : 00.90.03
           UUID : b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
  Creation Time : Sat Nov  1 22:14:18 2008
     Raid Level : raid5
  Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
     Array Size : 2930287488 (2794.54 GiB 3000.61 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0

    Update Time : Mon Sep 20 19:24:26 2010
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0
       Checksum : e9cec786 - correct
         Events : 68

         Layout : left-symmetric
     Chunk Size : 64K

      Number   Major   Minor   RaidDevice State
this     2       8       32        2      active sync   /dev/sdc

   0     0       8        0        0      active sync   /dev/sda
   1     1       8       16        1      active sync   /dev/sdb
   2     2       8       32        2      active sync   /dev/sdc
   3     3       8       48        3      active sync   /dev/sdd
root adam-desktop:~# mdadm --examine --verbose /dev/sde
/dev/sde:
          Magic : a92b4efc
        Version : 00.90.03
           UUID : b5e0fcd0:cfadbb04:a5b6f22e:457f47ae
  Creation Time : Sat Nov  1 22:14:18 2008
     Raid Level : raid5
  Used Dev Size : 976762496 (931.51 GiB 1000.20 GB)
     Array Size : 2930287488 (2794.54 GiB 3000.61 GB)
   Raid Devices : 4
  Total Devices : 4
Preferred Minor : 0

    Update Time : Mon Sep 20 19:24:26 2010
          State : clean
 Active Devices : 4
Working Devices : 4
 Failed Devices : 0
  Spare Devices : 0
       Checksum : e9cec798 - correct
         Events : 68

         Layout : left-symmetric
     Chunk Size : 64K

      Number   Major   Minor   RaidDevice State
this     3       8       48        3      active sync   /dev/sdd

   0     0       8        0        0      active sync   /dev/sda
   1     1       8       16        1      active sync   /dev/sdb
   2     2       8       32        2      active sync   /dev/sdc
   3     3       8       48        3      active sync   /dev/sdd


root adam-desktop:~# fdisk -l

Disk /dev/sda: 60.0 GB, 60011642880 bytes
255 heads, 63 sectors/track, 7296 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x0005cd42

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        6993    56165376   83  Linux
/dev/sda2            6993        7296     2437121    5  Extended
/dev/sda5            6993        7296     2437120   82  Linux swap / Solaris

Disk /dev/sdb: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdb1 1 121601 976760001 fd Linux raid autodetect

Disk /dev/sdc: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdc1 1 121601 976760001 fd Linux raid autodetect

Disk /dev/sdd: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sdd1 1 121601 976760001 fd Linux raid autodetect

Disk /dev/sde: 1000.2 GB, 1000204886016 bytes
255 heads, 63 sectors/track, 121601 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 512 bytes / 512 bytes
Disk identifier: 0x00000000

   Device Boot      Start         End      Blocks   Id  System
/dev/sde1 1 121601 976760001 fd Linux raid autodetect

Disk /dev/md0: 3000.6 GB, 3000614387712 bytes
255 heads, 63 sectors/track, 364803 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Sector size (logical/physical): 512 bytes / 512 bytes
I/O size (minimum/optimal): 65536 bytes / 196608 bytes
Disk identifier: 0x00000000

    Device Boot      Start         End      Blocks   Id  System
/dev/md0p1 1 121601 976760001 fd Linux raid autodetect
Partition 1 does not start on physical sector boundary.
root adam-desktop:~# cat /proc/partitions
major minor  #blocks  name

   8        0   58605120 sda
   8        1   56165376 sda1
   8        2          1 sda2
   8        5    2437120 sda5
   8       16  976762584 sdb
   8       17  976760001 sdb1
   8       32  976762584 sdc
   8       33  976760001 sdc1
   8       48  976762584 sdd
   8       49  976760001 sdd1
   8       64  976762584 sde
   8       65  976760001 sde1
   9        0 2930287488 md0
 259        0  976760001 md0p1
root adam-desktop:~# cat /proc/mdstat
Personalities : [linear] [multipath] [raid0] [raid1] [raid6] [raid5] [raid4] [raid10]
md0 : active raid5 sde[3] sdb[0] sdc[1] sdd[2]
      2930287488 blocks level 5, 64k chunk, algorithm 2 [4/4] [UUUU]

unused devices: <none>


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