[asterisk-users] Scaling

[Matt Florell]

On 6/17/09, Gordon Henderson <gordon+asterisk at drogon.net> wrote:
> On Wed, 17 Jun 2009, Steve Totaro wrote:
>
>  > Hi,
>  >
>  > Quick question to the real world.
>  >
>  > Approx what specs would I need on server to handle 95 ZAP or Dahdi -> SIP
>  > gateway using G729 on the SIP to carrier side (nothing else, just media
>  > conversion)?
>  >
>  > Does the latest Asterisk/DAHDI significantly improve these numbers over say,
>  > Asterisk 1.2.X?
>  >
>  > Sure, there is plenty to read but nothing I could find quickly on my exact
>  > needs that was clear and I want to be fairly sure before ordering a server.
>  >
>  > Obviously load avg has something to do with it but CPU and mem seems to be
>  > the biggest factors.
>
>
> Transcoding - It's CPU grunt and multi processors what you need (more so
>  than memory) - handling that many calls ought to be a breeze on any modern
>  hardware without the transcoding. Personally, I think I'd be looking at a
>  TC400B card which can handle 96 concurrent g729 transcodes...
>
>  But as a rough benchmark, I can do 12 concurrent g729 transcodes on a 1GHz
>  VIA processor before it's totally maxed out, (stupid) extrapolation to 96
>  would suggest 8 x 1GHz processors, 4 x 2GHz, or 3 x 3GHz processors...
>  However you gain more with the faster processors in terms of bigger cache
>  (but that can also be a loss too) I'd start with a quad core system and
>  see how it goes under benchmark...
>
>  Gordon

The TC400B is up to 120 channels of G729a now:
http://www.digium.com/en/products/voice/tc400b.php


MATT---