Re: Mount options for mostly-offline drives

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On Wed, 2020-06-03 at 08:33 +1000, Cameron Simpson wrote:
> On 02Jun2020 10:57, Patrick O'Callaghan <pocallaghan@xxxxxxxxx> 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.
> 
> My own solution, here and at a client, is to have the backup script do 
> the mount and umount. This has the advantage that the backups aren't 
> even available for mangling the rest of the time. A script like this:
> 
>     if mount /the/backup/volume
>     then
>       ... run the backup ...
>       umount /the/backup/volume
>     fi
> 
> works nicely. The md stuff should, I expect, leave things alone except 
> for the weekly(?) rescan.
> 
> It also means that if you know the backup's over you can freely unplug 
> them (eg put them on a shelf or in a drawer, or send one set off site).

Good idea. I expect I'll want to use the drives for something else in
the future (they're nearly empty), which is why I wanted it to be
automatic, but for now it's a reasonable workaround.

poc
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