On Tue, 2020-06-02 at 11:57 +0100, Patrick O'Callaghan wrote:
> On Tue, 2020-06-02 at 18:18 +0800, Ed Greshko wrote:
> > 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.
> 
> Thanks Ed. I managed to find the man pages under systemd-mount(1) but
> it took a while. The man page for mount(1) should have a reference but
> doesn't.

Doesn't seem to do anything. I've tested with this line in /etc/fstab:

UUID=6cb66da2-147a-4f3c-a513-36f6164ab581  /raid   ext4    
rw,x-systemd.automount,x-systemd.device-timeout=1,x-systemd.idle-timeout=60     
0 0

followed by 'mount -a' (using a 60-second timeout for testing) but it's
not unmounting. I also ran 'journalctl -f' but it doesn't show
anything.

poc
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