Hi
if you try to umount an NFS mountpoint this way
root:~> umount /mountpoint
and your shell answer this way
umount: /mountpoint: device is busy
umount: /mountpoint: device is busy
then try killing all processes using the mountpoint and update the nfs export fs
root:~> fuser -k -m /mountpoint
root:~> exportfs -au
at this point, you can safely umount
root:~> umount /mountpoint
peace!
