On 2020-06-02 17:57, Patrick O'Callaghan wrote:
> I have a powered USB dock with a couple of SATA drives configured as
> RAID1, and used only for nightly backups. The (minimal) manual for the
> dock tells me it will power down after 30 minutes idle time, however I
> don't see this happening. I presume that something (such as the md
> system) is touching the drives periodically.
>
> What is the fstab option to have the drives mounted only when accessed?
> This used to be automount (or autofs) but with systemd getting its
> fingers into everything I know longer know how to do this.
>
> Can the drive be automatically unmounted if not in use? I presume this
> would stop md from trying to check it and hence prevent the dock from
> keeping it powered on.


I've not tried the timeouts....  But I think you are looking for these options

x-systemd.automount, x-systemd.device-timeout=10, x-systemd.idle-timeout=1800

I use x-systemd.automount for nfs4 mounts but the NAS takes care of spinning 
down.

-- 
The key to getting good answers is to ask good questions.
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