Difference between df -k and du -sh
The files you removed are probably still opened by a process. Check:
lsof -a +L1 /export
I think this is because:
-
dfchecks blocks available (superblocks) -
dutotals up the space of each file.
One or more applications have files open on /export, but the filenames themselves no longer exist (i.e. have been deleted).