On 15/03/2021 07:37, Patrick O'Callaghan wrote:
The only remaining problem (touch wood) is to get the power-down script
to run after a timeout. I'll consider writing a special script to
monitor the mount status independently of systemd.

You can consider using the timer/service pair of systemd.

Add another Wants to raid.mount of say "raid.timer".  Then....

1.  Upon mount, raid.timer is started.
2.  After defined time, raid.timer calls "raid.service".
3.  raid.service checks mount status.
4.  If still mounted then exit.  Meaning goes back to waiting and #2.
5.  If now unmounted, power off the hub and stop raid.timer.  So, basically, 
raid.service no long runs
     and you're back to condition #1 which starts the timer again on the next 
mount.


--
People who believe they don't make mistakes have already made one.

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