We had a filesystem that kept growing in size even though the user was deleting the log files. du and df didn't match up and it was starting to be a problem. We restarted one of the apps and got back a little space so I figured there were still open file handles holding on to the space.
>>lsof | grep deleted
That showed me the app that was holding on to the space.
>>lsof | grep deleted | awk '{print $1, $2, $7, $9}'
Then on the PID of the app I ran:
>>kill -HUP 8787
Presto, that freed up all the disk space.
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