Negative hdd usage. Available is larger than fullsize

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http://unix.stackexchange.com – Having issues with space accounting of lvm volume. 23G is available. But the full size of the partition is 20G. (So, it shows "-4.1G used" 0_O) > df -h Filesystem Size Used Avail Use% Mounted on /dev/mapper/VolGroup00-LogVol01 20G -4.1G 23G - / /dev/mapper/VolGroup00-LogVol02 63G 31G 29G 52% /porta_var /dev/mapper/VolGroup00-LogVol00 20G 3.3G 16G 18% /update_root /dev/cciss/c0d0p1 99M 13M 82M 13% /boot tmpfs 7.9G 0 7.9G 0% /dev/shm Any ideas? P.S. uname - (HowTos)