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filesystem not full, but 0% available

I ran into a curious problem today:

Filesystem           1K-blocks      Used        Available Use% Mounted on
/dev/sda3            684172708     652718132       0      100% /mnt/sda3

While there should be 30GB available it shows that its full.  The partition is my /-partation and party of my linux ( thinks that this partition is really full.  Syslogd/Klogd are not working and /tmp is mounted as overflow-Ramdisk on boot.

I did a forced fsck twice by now, and I booted into a brand new 2.6.28-11-kernel and ext2-tools version 1.41.4 and the same problem.

Whats going on here? Anything left I can to debug or solve this problem? Next step is to backup all data on the disk, reformat the partition and restore the files, but actually this is not what I like to do on a regular base :)

fdisk does not complain about any harddisk/partition-troubles :
# fdisk -l /dev/sda

Disk /dev/sda: 750.1 GB, 750156374016 bytes
255 heads, 63 sectors/track, 91201 cylinders
Units = cylinders of 16065 * 512 = 8225280 bytes
Disk identifier: 0x00083824

   Device Boot      Start         End      Blocks   Id  System
/dev/sda1   *           1        4863    39062016   83  Linux
/dev/sda2            4864        5349     3903795   82  Linux swap / Solaris
/dev/sda3            5350       91201   689606190   83  Linux

and there is a second ext3-partition on the same disk (sda1) which doesnt have any similar problem. 

Would removing and adding the journal help? (I did this once but I cant remember why and especially how I did it)

Any help greatly appretiated,
I add the result of tune2fs -l /dev/sda3 at the end of this posting. Maybe it helps.

thnx a lot,

# tune2fs -l /dev/sda3 
tune2fs 1.41.4 (27-Jan-2009)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          3098e1e4-e120-469e-9e7b-41c2bb730b8f
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery sparse_super large_file
Filesystem flags:         signed_directory_hash 
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              43106304
Block count:              172401547
Reserved block count:     8620077
Free blocks:              7863644
Free inodes:              40182634
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      982
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8192
Inode blocks per group:   256
Filesystem created:       Wed Jun 18 10:19:42 2008
Last mount time:          Fri Apr  3 12:21:20 2009
Last write time:          Fri Apr  3 12:21:20 2009
Mount count:              1
Maximum mount count:      34
Last checked:             Fri Apr  3 11:09:13 2009
Check interval:           15552000 (6 months)
Next check after:         Wed Sep 30 11:09:13 2009
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               128
Journal inode:            8
Default directory hash:   tea
Directory Hash Seed:      3536ec11-ab59-45b4-a4a4-6f1a37901363
Journal backup:           inode blocks

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