df & du showing different usages for /var

[Wojciech Puchar]

> clean things up and ensure that it didn't happen again. Using the "du" 
> command to look for offending directories and files, I wiped out a bunch of 
> old Apache and Qmail logs...and then found that I was still using 90% of the

you forgot to restart apache and qmail.
and they keep these logs open.

in unix you may delete open file, but it will be actually deleted when 
closed.