Unmounting usb disk impossible

Polytropon freebsd at edvax.de
Wed Jul 22 18:59:21 UTC 2020

On Wed, 22 Jul 2020 19:58:22 +0200, Morten Bo Johansen via freebsd-questions wrote:
> On 2020-07-22 Mehmet Erol Sanliturk wrote:
> > You did not write your mount statement .
> I don't know what it is. It is automounted
> > It seems that your umount statement is completely wrong .
> > https://www.freebsd.org/cgi/man.cgi?query=umount&sektion=8
> > umount
> >
> > You are saying that
> >
> > "Unmount ALL of the mounted files in "fstab" .
> No, that is not what I am saying. This is from man autofs:
>     To unmount all mounted autofs filesystems:
>            umount -At autofs
> That was my command. And as you can see, it actually tries to
> unmount the usb disk under /media - which is correct. It just
> fails with this "device busy" error. I need to find out which
> process is accessing the mount point.

This command interpretation is similarly listed in "man 1 umount",
i. e., "umount -a -t <type>". However, have you checked that
the filesystems beneath /media, mounted by automountd, are listed
in /etc/fstab? This is a required condition according to the
manual page.

In worst case, try to add the -f (force) option to umount.
You should then verify, at least for testing, that the filesystems
in question are consistent (use fsck accordingly).

Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...

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