[mythtv-users] Mooting architecture for a DataDirect replacement - paging Brad Templeton to the thread
Jay R. Ashworth
jra at baylink.com
Fri Jun 22 19:36:31 UTC 2007
On Fri, Jun 22, 2007 at 03:32:49PM -0400, Dan Ritter wrote:
> > That said, I've never run INN or any other newsserver; my Usenet
> > experience, although more than 15 years in duration, has been strictly
> > as a consumer, not a provider. I am not worried about learning care
> > and upkeep for a newsserver; however, I can't guarantee that my setup,
> > as sophisticated as it is, will be sufficient to handle the kind of
> > traffic necessary.
> Let's suppose that you were going to be a central node for the US. How
> much disk space and bandwidth? A quick estimate, all numbers made up.
> A channel has 2 programs per hour all day long: 48 programs per
> day. You'll store 14 days, or 672 programs, times 3000 channels
> in the US. Just over 2 million entries. Each day 150,000 entries
> get changed. That about 1.7 a second. We'll say 2 per second.
> A program is a start time, a finish time, a channel id, a
> program number, a title, a subtitle, a description, an episode
> number, yadda yadda yadda. About a kilobyte, all told. So,
> 16Kbits/second on average, storage of 150MB. Let's say 300MB,
> we're inefficient. Even if an XML representation triples it,
> which it shouldn't, everyone has enough space to store all the
> program information they will need.
Nice math. My envelope was dirty...
> People on dialup won't want to use this. People on cheaper DSL
> lines will only be interested in being clients. But pretty much
> anyone else can be at least a small server node, with 2 or 3
> local neighbors just pulling down their regional groups and 2 or
> 3 big nodes feeding them. A big node should have more bandwidth,
> but doesn't need much else.
Gee... that sounds just like... Usenet *used* to be.
Can we put the Myth discussions newsgroups on that feed, too? :-)
> NNTP is pretty efficient -- it's one of those old-style
> telnettable protocols that a human can learn to speak in a few
> minutes. Less than 5% overhead on the line.
> Usenet was deep magic when a T1 and 10 GBs storage made you a
> decent regional ISP. Now? Not so much, unless you want to carry
> all the traffic in the world. Especially, not carrying binaries
> reduces the traffic by a factor of, oh, a hundred. Maybe more, I
> haven't checked lately.
Thank ghod you're here, Dan; we'd have had to invent you. :-)
Come to think of it, Brad Templeton is here, too, and he probably knows
more about Usenet than ell of us put together.
Jay R. Ashworth Baylink jra at baylink.com
Designer The Things I Think RFC 2100
Ashworth & Associates http://baylink.pitas.com '87 e24
St Petersburg FL USA http://photo.imageinc.us +1 727 647 1274
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