<div dir="ltr">
<div class="gmail_extra"><div><br></div>
<br><br><div class="gmail_quote">On Tue, Jun 3, 2014 at 2:27 PM, Stephen Worthington <span dir="ltr"><<a href="mailto:stephen_agent@jsw.gen.nz" target="_blank">stephen_agent@jsw.gen.nz</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
<div><div class="h5">On Mon, 2 Jun 2014 20:59:49 +0200, you wrote:<br>
<br>
>Hi,<br>
><br>
>I’m running myth 0.27 (v0.27.1-7-g41d04b6) on Ubuntu server 14.04 with an i5(3GHz) and 4GB memory. I’m using 4 DVB-S2 tuners as source.<br>
>Due to relocation of the dish I have to install a slave backend. I can’t (don’t want to) move my server to the garden shed.<br>
><br>
>I have found that recording about 8-10 HD channels simultaneously will start killing processes on the backend (not the myth processes though), but the CPU load of the DVB-s2 stuff by itself requires 100% cpu. Mythcommflagging did not help either, although I could limit the simultaneous jobs to get more breathing space.<br>
>So my thought was to solve both problems at the same time with a new slave backend, where the dvb-s2 stuff is running, by itself. Storage and commflagging still to be done on the master backend (which has 8TB of ZFS storage)<br>
><br>
>I can see two issues now:<br>
>Bandwidth: When recording 10 channels (what I want to achieve), I estimate worst case (based on what i recorded so far) 3GB per channel per hour, or 833Mb/s one way traffic, without other overhead. And not watching anything...<br>
>How to solve this, and does myth traffic between master and slave benefit from Jumbo Frames. I could use two network cards in each machine, and create a 2 x1 Gb trunk between the switches.<br>
>Second part of the problem might be that the ZFS file storage is not fast enough. (upgrade to SSD maybe)<br>
><br>
>Configuration:<br>
>Is it possible to configure mythtv in such a way that it does what I want, or are there better ways to do this?<br>
><br>
>Any help appreciated!<br>
><br>
>Johan<br>
<br>
</div></div>Have you had a look at vtuner (virtual tuners)? If it works with the<br>
drivers for your DVB-S2 cards, that would allow you to have a minimal<br>
Linux box in your shed with just the real tuners and ethernet in it,<br>
and have the tuners appear as though they were on you main backend<br>
box.<br>
<br>
<a href="https://code.google.com/p/vtuner/" target="_blank">https://code.google.com/p/vtuner/</a><br>
<br>
There are also commercial boxes with builtin tuners that use vtuner.<br></blockquote><div><br></div><div>Thanks for the tip, but I believe I achieve the same with a slave backend and use the master backend storage pool through nfs. I'm just fooling myth..But maybe I see this wrong. Nevertheless its unlikely that my drivers will support this, as they were compiled from the TBS development tree. </div>
<blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;padding-left:1ex;border-left-color:rgb(204,204,204);border-left-width:1px;border-left-style:solid">
<div><div class="h5">_______________________________________________<br>
mythtv-users mailing list<br>
<a href="mailto:mythtv-users@mythtv.org">mythtv-users@mythtv.org</a><br>
<a href="http://www.mythtv.org/mailman/listinfo/mythtv-users" target="_blank">http://www.mythtv.org/mailman/listinfo/mythtv-users</a><br>
<a href="http://wiki.mythtv.org/Mailing_List_etiquette" target="_blank">http://wiki.mythtv.org/Mailing_List_etiquette</a><br>
MythTV Forums: <a href="https://forum.mythtv.org" target="_blank">https://forum.mythtv.org</a><br>
</div></div></blockquote></div><br></div></div>