Incorrect df -k output??

[Peter Jeremy]

On 2007-May-08 13:04:55 +0400, Hanatsu Tori <hanatsu.tori at gmail.com> wrote:
>xxxxx# df -k
>Filesystem  1K-blocks     Used    Avail Capacity  Mounted on
>/dev/ad4s1a  76866422 51507978 19209132    73%    /
>devfs               1        1        0   100%    /dev
>*/dev/ad6s1d  77879478 75006042 -3356922   105%   /usr/home/ftp/pub/ARCHIEVE*
>
>
>xxxxx# du -sk /usr/home/ftp/pub/ARCHIEVE
>*75006042        /usr/home/ftp/pub/ARCHIEVE*

df reports 75006042KB used and du reports 75006042KB used.  Where is
the problem?

>xxxxx# df -h
>Filesystem     Size    Used   Avail Capacity  Mounted on
>/dev/ad0s1a    496M     36M    420M     8%    /
>devfs          1.0K    1.0K      0B   100%    /dev
>/dev/ad0s1d    1.9G    425M    1.4G    23%    /tmp
>/dev/ad0s1f    136G     70G     55G    56%    /usr
>*/dev/ad0s1e    3.9G    3.6G    -21M   101%    /var
>*/dev/ad2s1d    144G     25G    108G    19%    /hd2
>procfs         4.0K    4.0K      0B   100%    /proc
>
>xxxxx# du -sh /var
>*202M    /var*

This is a bit less obvious - there does appear 3.4GB missing.  I'll
make the assumption that the 'df' output is complete (ie there isn't
another filesystem mounted over part of /var) and neither figure is
misleading (ie there isn't whitespace in either name and no chrooting
or jails are in use).

The remaining possibilities are:
a) A running process has an unlinked file open.
   The space will be released when the process closes the file.
b) Filesystem snapshots exist.
   Use snapinfo(8) to check and "rm" them if appropriate
c) A combination of UFS and/or fsck bugs and system crashes have lost space.
   Shutdown or reboot to single user mode and explicity fsck /var.

Since you have already bounced the server, it is unlikely to be option
a (unless the same process has just grabbed the space again).

-- 
Peter Jeremy
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