<p>Is the USB on a R pi a bottleneck? If its a 480 usb 2 interface, suggests to me the 100 nic is more likely to be the constricter - or seems likely to be the deeper architecture? Im still waiting for mine to test this.... Anyone tested this?</p>
<p>I've been considering using a Rpi master backend, that connects with a hdhomerun (or two?) and some sort of inevitably noisy multi hdd multi TB machine out of ear shot in a utility space, preferably with demand power control on that machine.</p>
<p>A significant concern expressed previously is that the scheduler is a significant run job that may be too big for the pis cpu to handle, which I think is about the equivalent of a pentium 400 (?). It seems if a sheevaplug can run the scheduler then a pi should be able to also(?). </p>
<p>A more concerning question for me is what will the simultaneous recording / playback capacity be, having a system working that has effectively had no discernable limits (where 8 hd programs can be simultaneously recorded with seamless recording playback co-existing (using 2 x 500 pci cards) = +++ kudos to the devs!) seems a level of performance that a rpi will be challenged to approach where the single LAN pipe will be at least part of the constraints explanation...<br>
</p>
<div class="gmail_quote">On Nov 30, 2012 7:22 AM, "Tyler T" <<a href="mailto:tylernt@gmail.com">tylernt@gmail.com</a>> wrote:<br type="attribution"><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
I use a SheevaPlug for my Myth BE. I can record two HD shows from my<br>
HDHomeRun, not sure about 3 (I do have multirec enabled, so maybe I<br>
have... never checked).<br>
<br>
The thing about the Pi is the USB bottleneck for disk I/O. Worse, the<br>
Pi's network adapter is also routed through USB internally. CPU<br>
shouldn't be a problem, and RAM shouldn't be a problem (especially<br>
with the new 512MB Pi), but disk AND network I/O being shoveled<br>
through one USB host controller would probably choke.<br>
<br>
The Pi aside, some other ARM device (NAS or Sheeva) with eSATA/SATA*<br>
ought to have the I/O grunt you need for a BE. The Pi could still be a<br>
separate FE, albeit running XBMC since Myth doesn't support the Pi's<br>
OpenMAX video acceleration yet.<br>
<br>
* Not all Sheeva and cousins have SATA, check the specs to be sure.<br>
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