Comment 3 for bug 521648

I have the same problem. I grow a RAID-5 from 9 to 14 discs. Then I wished to check up and expand a file system.

# fsck.ext4 /dev/md0
e2fsck 1.41.9 (22-Aug-2009)
Error determining size of the physical device: File too large

# resize2fs /dev/md0
resize2fs 1.41.9 (22-Aug-2009)
resize2fs: File too large while trying to determine filesystem size

The additional information:
Ubuntu Server 9.10

# uname -a
Linux server4 2.6.31-20-server #57-Ubuntu SMP Mon Feb 8 09:59:59 UTC 2010 x86_64 GNU/Linux

# cat /proc/mdstat
md0 : active raid5 sdn[13] sdc[10] sdk[6] sda[9] sdj[7] sdi[0] sdb[11] sdg[3] sdd[8] sdh[1] sdm[12] sdf[4] sdl[5] sde[2]
      19046800448 blocks level 5, 64k chunk, algorithm 2 [14/14] [UUUUUUUUUUUUUU]

# blkid /dev/md0
/dev/md0: UUID="a90d6711-627e-4d01-8db7-3f2fa16de2f9" TYPE="ext4"

HELP ME!
After reboot, /dev/md0 cannot mount !

# mount -t ext4 /dev/md0 /mnt/md0/
mount: wrong fs type, bad option, bad superblock on /dev/md0,
       missing codepage or helper program, or other error
       In some cases useful info is found in syslog - try
       dmesg | tail or so

# dmesg | tail
[ 1058.903277] EXT4-fs (md0): ext4_check_descriptors: Checksum for group 12173 failed (14802!=36012)
[ 1058.903295] EXT4-fs (md0): group descriptors corrupted!

# fsck.ext4 /dev/md0
e2fsck 1.41.9 (22-Aug-2009)
Error determining size of the physical device: File too largee: File too large