[asterisk-users] Scaling

[Steve Totaro]

On Wed, Jun 17, 2009 at 3:18 PM, John Todd <jtodd at digium.com> wrote:

>
> On Jun 17, 2009, at 8:16 AM, 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.
> >
> > --
> > Thanks,
> > Steve Totaro
> > +18887771888 (Toll Free)
> > +12409381212 (Cell)
> > +12024369784 (Skype)
>
>
> [Digium hat off, ITSP (previous employer) hat on.]
>
> Not speaking for Digium on this one, but speaking from personal
> experience at another company.
>
> We could get 100 G.729 channels in a 2x3ghz P4 machine with plenty of
> CPU room to spare, 4+ years ago, and that rule of thumb served us
> well.  This was for SIP (G.711<->G.729) but I can't imagine that DAHDI
> or Asterisk takes significantly more or less horsepower for this task
> now for the base transcoding load.
>
> JT
>
> ---
> John Todd                       email:jtodd at digium.com<email%3Ajtodd at digium.com>
> Digium, Inc. | Asterisk Open Source Community Director
> 445 Jan Davis Drive NW -  Huntsville AL 35806  -   USA
> direct: +1-256-428-6083         http://www.digium.com/
>
>
>
>
John,

Thanks for the info.

Can't go wrong with these in a cluster if you are correct.
http://www.surpluscomputers.com/348663/hp-dl140-proliant-dual-xeon.html

I used to have a garden of seven (too small to be a farm) of Asterisk boxen
that were simple PRI to SIP gateways doing ulaw (no transcoding as far as
codec), and nothing else running, just a few lines in each conf file.

They would run at ~65% CPU utilization with 95 channels in use on each box.

This was the Asterisk, Zaptel, Libpri 1.2.X flavor.

I wonder if anyone else has input on the CPU utilization of of a simple PSTN
<-> VoIP gateway based on Asterisk?

-- 
Thanks,
Steve Totaro
+18887771888 (Toll Free)
+12409381212 (Cell)
+12024369784 (Skype)
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