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[SOLVED] umount.nfs: /data/export: device is busy

Error added: 2011-05-14T17:05:13Z

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Answer 1757 (0.0% helpful)

Some process is holding onto open file(handle)s. Those processes may need to be killed
Use command 
sudo fuser /data/export
it will tell you the process ids, then you can use
sudo lsof -n -p processid
or kill [-9] processid
to see more 
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