On Wed, Dec 22, 2010 at 9:22 AM, Henry Coleman
<henry.cole...@voip-pbx.ca> wrote:
>> Inserting the stick and refreshing the GUI page shows the new directory
>> structure on the USB stick.
>> However after a backup they get saved to the HD directory instead

You lost me there. If the USB is mounted on top of
/var/lib/asterisk/backups, then it would be impossible for you to
write to that directory and have it written to the hard disk.

>> Unplugging the USB stick does not restore the original HD directory, only a 
>> reboot does this.

We probably need to fix something in this section:

# Clean up after removal
ACTION=="remove", ENV{dir_name}!="", RUN+="/bin/umount -l
/var/lib/asterisk/backups"

After removing the usb key, try running the unmount manually and see
what it says:

# /bin/umount -l /var/lib/asterisk/backups

There should also be a log of what happened in /var/log/messages
(That's assuming CentOS uses /var/log/messages for udev logging).

The most likely explanation is that the file system is "busy"
preventing it from being unmounted. If that is the case you can do (as
root):

# lsof | grep /var/lib/asterisk/backups

to find out what it is.

-- 
John Lange
www.johnlange.ca

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