Disk space usage doesn't add up with df & du

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http://serverfault.com – I'm trying to free up some disk space - if I do a df -h, I have a filesystem called /dev/mapper/vg00-var which says its 4G, 3.8G used, 205M left. That corresponds to my /var directory. If I descend into /var and do du -kscxh *, the total is 2.1G 2.1G + 200M free = 2.3G... So my question is, where is the remaining 1.7G ? (HowTos)