Question about xfs_repair

[Matt Tehonica <matt.tehonica@xxxxxxx>]

Hi all,

I was discussing this with linux-raid and they suggested trying linux-xfs now.  Here is the story... I converted my RAID5 from 8 disks to 6 disks using "mdadm --grow /dev/md0 --array-size" and then "mdadm --grow /dev/md0 --raid-devices=6" and after rebooting, it won't mount.  It has been running fine for about a year.  File system is XFS.  I didn't know you had to resize the xfs partition before resizing the raid array so now I'm stuck trying to repair XFS after truncating the array.

I tried running xfs_repair and it will just run forever and says "............................found candidate secondary superblock...
error reading superblock 80 -- seek to offset 7501512704000 failed
unable to verify superblock, continuing...
..........................................................................................................................................". 

I'm trying to recover whatever data I can, if any.

Here is some info on it....

mtehonica@ghostrider:~$ sudo mdadm -D /dev/md0 
/dev/md0:
       Version : 1.01
 Creation Time : Mon Dec 21 19:40:58 2009
    Raid Level : raid5
    Array Size : 7325690880 (6986.32 GiB 7501.51 GB)
 Used Dev Size : 1465138176 (1397.26 GiB 1500.30 GB)
  Raid Devices : 6
 Total Devices : 8
   Persistence : Superblock is persistent

   Update Time : Wed Feb 16 19:13:50 2011
         State : clean
Active Devices : 6
Working Devices : 8
Failed Devices : 0
 Spare Devices : 2

        Layout : left-symmetric
    Chunk Size : 512K

          Name : ghostrider:0  (local to host ghostrider)
          UUID : b4ba7316:08976ceb:3ab7af7b:430ff147
        Events : 327264

   Number   Major   Minor   RaidDevice State
      0       8       80        0      active sync   /dev/sdf
      1       8       16        1      active sync   /dev/sdb
      3       8       64        2      active sync   /dev/sde
      4       8       48        3      active sync   /dev/sdd
      5       8        0        4      active sync   /dev/sda
      8       8      112        5      active sync   /dev/sdh

      6       8      144        -      spare   /dev/sdj
      7       8      128        -      spare   /dev/sdi


mtehonica@ghostrider:~$ sudo mdadm -E /dev/sda 
/dev/sda:
         Magic : a92b4efc
       Version : 1.1
   Feature Map : 0x0
    Array UUID : b4ba7316:08976ceb:3ab7af7b:430ff147
          Name : ghostrider:0  (local to host ghostrider)
 Creation Time : Mon Dec 21 19:40:58 2009
    Raid Level : raid5
  Raid Devices : 6

Avail Dev Size : 2930276904 (1397.26 GiB 1500.30 GB)
    Array Size : 14651381760 (6986.32 GiB 7501.51 GB)
 Used Dev Size : 2930276352 (1397.26 GiB 1500.30 GB)
   Data Offset : 264 sectors
  Super Offset : 0 sectors
         State : clean
   Device UUID : 83ff92c5:b7acdfcd:d3ace2b5:0ac3549a

   Update Time : Wed Feb 16 19:13:52 2011
      Checksum : 5053499e - correct
        Events : 327264

        Layout : left-symmetric
    Chunk Size : 512K

  Device Role : Active device 4
  Array State : AAAAAA ('A' == active, '.' == missing)


mtehonica@ghostrider:~$ sudo mount /dev/md0 /test
mount: /dev/md0: can't read superblock


Thanks in advance!
Matt
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