for the filesystem you want to unmount, do

fuser -cu /mount_pount

this will list the users currently using the mount point. If you cannot logout those users, do

fuser -ck /mount_point

Sometimes processes do not show under ‘fuser /filesystem

Try using ‘fuser /dev/vgXX/lvolX’

Best thing is to use the logical volume name instead of the mount point.

#fuser -v /dev/vgxx/lvolxx

If these pids are not corresponding to any important processes, then

#fuser -k /dev/vgxx/lvolxx
#mount /mount_point

UNIX95=x ps -efH | more