[CentOS] umount problem

[Fred Smith]

On Tue, Oct 07, 2014 at 06:19:00PM -0400, m.roth at 5-cent.us wrote:
> Fred Smith wrote:
> > I've got a usb HD mounted, and it has been mounted since the weekend, and
> > has been kept busy during that period.
> >
> > now I"m done with it an want to umount it, but neither umount nor the
> > on-screen icon (when right-clicked) will let me do it:
> >
> > it is /dev/sdd1, mounted as /media/seagateusb. when root tries to
> > umount it we get this:
> <snip>
> It's under control of autofs. You can open the GUI file manager, and do a
> safely remove/eject.
> 
> Or you can stop autofs for a minute, and then umount it.

actually, no I can't. if I right-click on seagateusb and click unmount, I 
get an error box saying "Unable to unmount seagateusb. Cannot unmount
because file system on device is busy."

OTOH, if I choose "safely remove drive" instad, I get "Unable to stop 
drive. This file cannot be stopped."

I've killed all the shells and in fact all the interactive processes
then logged off and on, so I'm pretty sure it's nothing I ran that
is got a hold on the device. I hate to use the three-finger-salue from
Windows, just to fix a piddly little problem like this :)

-- 
---- Fred Smith -- fredex at fcshome.stoneham.ma.us -----------------------------
                        The Lord is like a strong tower. 
             Those who do what is right can run to him for safety.
--------------------------- Proverbs 18:10 (niv) -----------------------------