force unmount in linux

force unmount in linux

Sometimes when we try to unmount a device, we may endup with this error.

umount: /usr/local/eucalyptus: device is busy.
        (In some cases useful info about processes that use
         the device is found by lsof(8) or fuser(1))

Then, How to force unmount in Linux ?

Any of these commands may work

umount -f <Location>
umount -l <Location>

For me, The second one worked.

Reference:
http://www.cyberciti.biz/tips/how-do-i-forcefully-unmount-a-disk-partition.html