[mythtv-users] Remote recorder advice

Andrew Wilkinson andrewjwilkinson at gmail.com
Wed Mar 11 08:43:26 UTC 2020

Thanks Douglas, that's really great to hear. That's just what I'm looking
to achieve. I will try and set it up myself, and if it works ok I'll update
the wiki. Perhaps the wiki was written before this functionality existing.

Thanks everyone for your help,

On Tue, Mar 10, 2020 at 10:56 PM Douglas Paul <doug at bogon.ca> wrote:

> Hi,
> On Tue, Mar 10, 2020 at 09:51:04PM +0000, Andrew Wilkinson wrote:
> > Thanks, I wasn't aware of those settings. On the page
> > https://www.mythtv.org/wiki/User_Manual:Setting_Up#Slave_Backend it says
> > that "The design requires that all backends be powered on whenever any
> task
> > is running. You cannot save power by having some backends powered off
> even
> > if they are idle. Once all backends are idle they can all be powered
> off."
> > Does this mean that all the slave backends can be powered off, or that
> the
> > slaves and master have to be turned off together? I was hoping to keep
> the
> > master running 24/7 so we can watch recordings quickly, but that it would
> > turn the slave on and off as needed to do recordings.
> I'm not sure why it would say that.
> If you look here:
> https://www.mythtv.org/wiki/Setup_General
> Look at the option 'Master backend override'.
> Basically to do what you want, you need a few things:
>   * The master backend override option
>   * A common directory for recordings for all backends (NFS mounted in
>     the same place on each)
>   * Under 'Shutdown/Wakeup Options' set the 'Startup before recording'
>     option. It has to be long enough for the slave to POST, boot, and
>     start the backend. I used to use 300 seconds (5 minutes)
>   * The options mentioned before, and on that page under 'Backend Wakeup
>     settings'
>       -- It seems that documentation is misleading or wrong, unless the
>       implementation changed changed I used this. The SleepCommand is run
>       on the slave to shut it down -- such as '/sbin/halt -p'. The
>       WakeCommand is run on the master backend to wake up the slave
>       before a recording. This would be your WoL script for example.
> I ran this way for years, shutting down slaves exactly for the reason
> to save power. I had two slaves, and they would only both be on if all
> the recorders were needed. I have no tuners on my master backend to this
> day. And, I have no problems accessing recordings when the slave is off.
> The only caveat is that storage groups might not interact well with
> this. So, you might not want to use them with this.
> --
> Douglas Paul
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