[Asterisk-Users] Can this config sustain 30 users?

Tue Jun 13 10:15:13 MST 2006

Power supply is a 500w gold edition with an APC UPS/regulator.

So, It seems that no table exists to calculate demand imposed on the
equipment *prior* to purchase/quote to a customer (not good for
sales/consulting).

It is a bit strange that no one has come to this kind of table (even
digium), given the amount of gurus playing with asterisk (or is a well
kept secret).

So if tomorrow i need 50, 60 or 100 users, I just need to reinvent the wheel
every time.

I wonder if when you get the AsteriskBusiness Edition, that is one of
the questions that you can ask sales about. (I need to run ABE in XYZ
scenario, please sell me ABE and provide me with machine specs?)

So at the end, i cannot provide prices (without being overkill) to a
potential customer without spending money on a system prior to quote
and test it.

Im not even sure If im typing/asking correctly what I'm trying to
achieve. I certainly can use all your answers for the setups im
building, but, you know , being able to quote a customer using a
matrix of cpu/fsb/ram/zaptel will be interesting.

Hmmm, thinking about it that table will be gigantic!!! so that's
probably why is has not been created.

Definitely I will need to stress test my equipment to seee how can it scale.

But the question remains.......there must be a reference formula.

Thanks,

On 6/13/06, Tom Lynn <tom at tomlynn.com> wrote:
> Don't forget to be sure your power supplies are reliable, and if necessary
> redundant.
>
>
> On 6/13/06, Colin Anderson
> <ColinA at landmarkmasterbuilder.com> wrote:
> > Maybe you are over thinking it. I have 200 users on a quad Xeon 700 with 2
> > PRI's and we regularly have 40-60 channels up, no problem (believe me, if
> > there was a problem I'd have 200 guys freaking on my head). I rarely see >
> > 30% single-CPU usage, and that's only when Sendmail is invoked to send out
> a
> > voicemail.
> >
> > But yes, transcoding and reasonable echocancel values is key. If you are
> > connecting to the PSTN, ulaw all the way. If you are connecting to a
> > provider, use the codec of your choice as long as your provider supports
> it,
> > and make sure every phone and endpoint is set to use the same codec.
> >
> > I also have 30 IAX remote sites that support from 1 to 5 users, on P-II
> > 233's. I use them because they are bulletproof and they are so cheap if
> > something gets hosed we just throw it away and put in another one. Again,
> no
> > problem
> >
> > Maybe try your cheapo machine and if it doesn't work try a better box. You
> > already have the cheap machine, and the card will remain the same
> regardless
> > of what box you use.
> >
> >
> > -----Original Message-----
> > From: Erick Perez [mailto:eaperezh at gmail.com]
> > Sent: Tuesday, June 13, 2006 9:15 AM
> > To: Asterisk Users Mailing List - Non-Commercial Discussion
> > Subject: Re: [Asterisk-Users] Can this config sustain 30 users?
> >
> >
> > Well thanks all for your responses. My original intention was to
> > address the mistic know-how about machine calculations, and I still
> > feel the shadows remain.
> >
> > Why? Because to achieve a 24 user PBX-only/One E1, I was going to
> > install a Dual Xeon with 2 GB of RAM and a 3ware card runing RAID-1
> > with two sata3 disks.
> > Now This thread tells me that my dual core pentium d (a 700$ computer)
> > will do the work. (the other equipment costs about 3500.00$). I do
> > realize that i must minimize transcoding (ulaw all the way) but you're
> > telling me it will work for 24 users (let's say 30 for round numbers)
> > all with SIP phones in an IP network.
> >
> > Below are some comments that i found googling and doing some
> > calculations myself. I do not enforce or deny any of them, please feel
> > free to tell me if Im wrong.
> >
> > (not confirmed)a- A voice channel takes 30mhz (60mhz in duplex mode).
> > So A 2.66 Ghz CPU can sustain about 43 calls (2600mhz/60mhz=43calls),
> > not taking into account other factors that may increase/decrease the
> > number of calls at the same time.
> >
> > b- 24 users talking ulaw (-+ 80kbps per channel) consume 1920kbps and
> > in full duplex they consume 3840kbps (about 3.75 megabits/s).
> >
> > c- To Calculate the bandwidth DDR memory can achieve (example PC4200)
> > ,to get the transfer rate, multiply the width of the module (8 Bytes)
> > by the rated speed of the memory module (in MHz): (8 Bytes) x (533
> > MHz/second) = 4,264 Mbytes/second or 4.2 Gbytes/second (34gigabits/s),
> > hence the name PC4200
> >
> > So, will all of this in mind,
> > CPU Dual Core 533FSB, 2.66 Ghz speed
> > DDR533mhz, One gigabyte. (2x512)
> > Two Sata disks (each sata pumps 1.5 gigabits/s)
> > Motherboard Intel 945 at 533FSB
> >
> > Means that the cpu,the ram and the board can achieve (see point b)
> > about 34 gigabits of data transfer, but 24 users only generate 3.75
> > megabits. So this is more than covered.
> > However if we take into account the lowest performing component on
> > this system (the sata disks) we go down to 1.5gbits/s which still
> > seems to be enough.
> >
> > Please please correct me if im wrong (or crazy)
> >
> > Thanks,
> >
> >
> > References:
> > http://en.wikipedia.org/wiki/Front_side_bus (bus
> bandwidth table)
> > http://www.acme.com/build_a_pc/bandwidth.html
> > http://www.lostcircuits.com/memory/ddrii/
> >
> http://bvio.ngic.re.kr/Bvio/index.php?title=Front_side_bus
> >
> >
> > On 6/13/06, Mike Fedyk <mfedyk at mikefedyk.com> wrote:
> > > Erick Perez wrote:
> > > > I just don't want to install it and then after a 5th user going to
> > > > call someone the asterisk begin to crash due to lack of resuources.
> > > Check the wiki for SIP load generation tools you can use to test your
> > > setup on any number of calls you like.
> > > _______________________________________________
> > > --Bandwidth and Colocation provided by Easynews.com --
> > >
> > > Asterisk-Users mailing list
> > > To UNSUBSCRIBE or update options visit:
> > >
> http://lists.digium.com/mailman/listinfo/asterisk-users
> > >
> >
> >
> > --
> >
> ------------------------------------------------------------
> > Erick Perez
> > Panama Sistemas
> > Integradores de Telefonia IP y Soluciones Para Centros de Datos
> > Panama, Republica de Panama
> > Cel Panama. +(507) 6694-4780
> >
> ------------------------------------------------------------
> > _______________________________________________
> > --Bandwidth and Colocation provided by Easynews.com --
> >
> > Asterisk-Users mailing list
> > To UNSUBSCRIBE or update options visit:
> >
> http://lists.digium.com/mailman/listinfo/asterisk-users
> > _______________________________________________
> > --Bandwidth and Colocation provided by Easynews.com --
> >
> > Asterisk-Users mailing list
> > To UNSUBSCRIBE or update options visit:
> >
> http://lists.digium.com/mailman/listinfo/asterisk-users
> >
>
>
> _______________________________________________
> --Bandwidth and Colocation provided by Easynews.com --
>
> Asterisk-Users mailing list
> To UNSUBSCRIBE or update options visit:
>
> http://lists.digium.com/mailman/listinfo/asterisk-users
>
>
>

-- 
------------------------------------------------------------
Erick Perez
Panama Sistemas
Integradores de Telefonia IP y Soluciones Para Centros de Datos
Panama, Republica de Panama
Cel Panama. +(507) 6694-4780
------------------------------------------------------------