<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote">On Mon, May 5, 2014 at 7:46 AM, Gary Buhrmaster <span dir="ltr"><<a href="mailto:gary.buhrmaster@gmail.com" target="_blank">gary.buhrmaster@gmail.com</a>></span> wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div class="HOEnZb"><div class="h5">On Mon, May 5, 2014 at 11:16 AM, Wayne Roberts<br>
<<a href="mailto:wayne@therobertsfamily.eu">wayne@therobertsfamily.eu</a>> wrote:<br>
> Hi all,<br>
><br>
> I am in the process of shopping for my backend, and was wondering what<br>
> network card you "should" use (speed) ?? Is gigabit going to be fast enough<br>
> or should i push the envelope and go 10 gig?<br>
<br>
</div></div>*Usually*, 1Gb/s networks are sufficient.<br>
<br>
You did not state what your services you backend is going to be supporting<br>
(especially if it will be a "shared" system). For a BE, how many networked<br>
tuners, how many active frontends? A HD stream usually fits in (less than)<br>
about 20Mb/s, so you could be recording from 10 simultaneous network tuners,<br>
and playing back concurrently to 10 frontends and still be at no more than 40%<br>
network utilization with a gigabit card on a dedicated BE (and likely much less,<br>
since most HD content is not 20Mb/s). At those rates, your disk subsystem<br>
would probably need more attention than your network.<br>
<br>
As with all else, your mileage will vary.<br><br></blockquote><div>Years ago, I wanted to justify upgrading from 100-megabit hardware (i.e. switches) to gigabit. I set up 4 simultaneous recordings, on 2 dual-tuner OTA HDHRs, all on different multiplexes, with the highest-bandwidth broadcasters I could find. I was not able to saturate the network and get corrupted recordings. I had to use other justifications (like, "it just feels right") to upgrade.</div>
<div><br></div><div>I didn't try playing recordings on all three frontends at the same time as the 4 recordings, but I think it's safe to say that 1Gb/sec will do for almost everyone.</div></div><br></div></div>