Icecast - Dec 2006 - Server Requirements

Hi Mike,

Thanks for your fast and informative responce.
>> I'm looking to stream a large amount of conncurrent connects and
want
to
>> use icecast probably on a CentOS base. The bandwidth requirements are
over
>> 60 Mbps before any overheads, I'm looking at using some Dell SC1425
machines
>> but am not sure how many I'd need, I'd appreciated hearing your
experiences
>> and suggestions.
>>
>> I need to be able to stream the following simultaneous connections
>>
>> 700 * 64k
>> 255 * 128k
>
>That's closer to 80 Mbps than 60.
>
>>
>> Probably MP3 and also the following Ogg:
>> 1 * 32
>> 6 * 24
>
>Encoding on the server? Or elsewhere?
The encoding will be done client side, oddcast or SAM.
>If you're encoding on the server, you'll want to double-check that
the
>cpu won't get saturated. I expect that'll be fine, though, with a
>single machine. If the SC1425 is dual cpu or dual core (I can't
>remember), then you'll certainly be fine.
I was thinking along the lines of Dual 2.8 Zeons in the 1425, although if
I was using two machines for loadbalancing I could stick to just 1 CPU in
each.
>As for the bandwidth, a single server is more than capable of pushing
>80 Mbps. I'd look at multiple servers once you go above about 300-400
>Mbps (though realistically, you probably won't run into problems until
>700+, you want a substantial amount of headroom).
>
>Of course, you might want more than a single server for redundancy.
I had redundancy in mind, but wasn't sure a single server could manage such
outputs, so two 1425s loadbalancing the streams would do this job comfortably?

Now to worry about getting  a low latency 80M connection or two 40M's If
I use round robin dns for connections I could have the servers in geographically
separate locations, right?
>Mike
Thanks again Mike,

David.

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Hi,

I'm looking to stream a large amount of conncurrent connects and want to
use icecast probably on a CentOS base. The bandwidth requirements are over
60 Mbps before any overheads, I'm looking at using some Dell SC1425 machines
but am not sure how many I'd need, I'd appreciated hearing your
experiences
and suggestions.

I need to be able to stream the following simultaneous connections

700 * 64k
255 * 128k

Probably MP3 and also the following Ogg:
1 * 32
6 * 24

Thanks in Advance.

David

___________________________________________________________

Tiscali Broadband only 9.99 a month for your first 3 months!
http://www.tiscali.co.uk/products/broadband/

On 12/12/06, davidhooper at tiscali.co.uk <davidhooper at tiscali.co.uk>
wrote:
> Hi,
>
> I'm looking to stream a large amount of conncurrent connects and want
to
> use icecast probably on a CentOS base. The bandwidth requirements are over
> 60 Mbps before any overheads, I'm looking at using some Dell SC1425
machines
> but am not sure how many I'd need, I'd appreciated hearing your
experiences
> and suggestions.
>
> I need to be able to stream the following simultaneous connections
>
> 700 * 64k
> 255 * 128k
That's closer to 80 Mbps than 60.
>
> Probably MP3 and also the following Ogg:
> 1 * 32
> 6 * 24
Encoding on the server? Or elsewhere?

If you're encoding on the server, you'll want to double-check that the
cpu won't get saturated. I expect that'll be fine, though, with a
single machine. If the SC1425 is dual cpu or dual core (I can't
remember), then you'll certainly be fine.

As for the bandwidth, a single server is more than capable of pushing
80 Mbps. I'd look at multiple servers once you go above about 300-400
Mbps (though realistically, you probably won't run into problems until
700+, you want a substantial amount of headroom).

Of course, you might want more than a single server for redundancy.

Mike

hi david

On 12/12/06, davidhooper@tiscali.co.uk <davidhooper@tiscali.co.uk>
wrote:
> Hi,
>
> I'm looking to stream a large amount of conncurrent connects and want
to
> use icecast probably on a CentOS base. The bandwidth requirements are over
> 60 Mbps before any overheads, I'm looking at using some Dell SC1425
machines
> but am not sure how many I'd need, I'd appreciated hearing your
experiences
> and suggestions.
this is probably of some tangential relevance:

http://www.icecast.org/loadtest1.php

Oddsock tested up to 14,000 concurrent users - but it was only
listeners that were tested for.  it would be great to see another test
to simulate concurrent encoders and listeners.

anyway, Icecast appears to scale very nicely.

cheers

Chip

Hi Chip,
>hi david
>> Hi,
>>
>> I'm looking to stream a large amount of conncurrent connects and
want
to
>> use icecast probably on a CentOS base. The bandwidth requirements are
over
>> 60 Mbps before any overheads, I'm looking at using some Dell SC1425
machines
>> but am not sure how many I'd need, I'd appreciated hearing your
experiences
>> and suggestions.
>
>this is probably of some tangential relevance:
>
>http://www.icecast.org/loadtest1.php
Thanks for the link I will have a good look through. At first glance it's
looking impressive.
>Oddsock tested up to 14,000 concurrent users - but it was only
>listeners that were tested for. it would be great to see another test
>to simulate concurrent encoders and listeners.
Am I right in thinking when using the likes of SAM, Oddcast, Simplecast the
encoding is done clientside? Under what circumstance would the encoding load
be server-side? On-demand delivery?
>anyway, Icecast appears to scale very nicely.
It looks that way.
>cheers
>
>Chip
Thanks,
David

___________________________________________________________

Tiscali Broadband only 9.99 a month for your first 3 months!
http://www.tiscali.co.uk/products/broadband/