Subject: Identifying what is accessing a USB device.
I have an external USB-3 2-disk docking station, and a script which
can
power up and down the drives as needed.
I have a systemd automount unit that correctly powers up the dock when
accessed, then mounts the drives (thanks Ed).
After an idle time, automount unmounts the drives. A script detects
when this happens and powers them down ... *at which point they
immediately power up again, and remain up until I intervene manually,
even though they are unmounted*.
This never happens if I run the script directly from the command line
(i.e. the drives power down and stay down).
I'm open to suggestions if anyone has any ideas.
The systemd service unit has a Restart=on-failure, or a Restart=always
line???
Geoff