Huge difference between output of "du" and "df"


How full is this filesystem?
Can someone explain the discrepancy:
[root@vrc45sd ~]# mount
/dev/sda3 on / type ext3 (rw)
proc on /proc type proc (rw)
sysfs on /sys type sysfs (rw)
devpts on /dev/pts type devpts (rw,gid=5,mode=620)
/dev/sda1 on /boot type ext3 (rw)
tmpfs on /dev/shm type tmpfs (rw)
none on /proc/sys/fs/binfmt_misc type binfmt_misc (rw)
sunrpc on /var/lib/nfs/rpc_pipefs type rpc_pipefs (rw)
[root@vrc45sd ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/sda3              80G   51G   25G  68% /
/dev/sda1              99M   26M   69M  28% /boot
tmpfs                 754M     0  754M   0% /dev/shm
[root@vrc45sd ~]# du -scm /
22466   /
22466   total

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Thanks!

alpha-lemmingAsked:
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jghelfman40Connect With a Mentor Commented:
I was going to give a straight answer, until I saw this thread:
http://lists.centos.org/pipermail/centos/2009-September/082986.html

You may wish to look at it and do some investigation.

du and df report differently, and there are ways to figure out what is the right amount.

There is no clear answer, as there can be different reasons for the numbers you are seeing.
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ericnilsCommented:
I'm not sure why, but I am getting odd measurements using the -scm options as well.

Try this instead:
du -h --max-depth=0 /
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omarfaridConnect With a Mentor Commented:
have you deleted huge files recently which could be still in use (open) by some processes? Try to reboot and see if there still big difference
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