[asterisk-users] Server Optimization and Load Balancing

[Bill Gibbs]

Keep us posted!  You have a good real world load with some decent
horsepower behind it so it will be interesting to see how your temporary
changes you have planned in the next few days pan out...I suspect the
SOHO switches could be part of the problem.

 

What is the load on the server?  

 

Bill

 

________________________________

From: asterisk-users-bounces at lists.digium.com
[mailto:asterisk-users-bounces at lists.digium.com] On Behalf Of Mitch
Jackson
Sent: Tuesday, July 11, 2006 10:44 AM
To: asterisk-users at lists.digium.com
Subject: [asterisk-users] Server Optimization and Load Balancing

 

I'm hoping to get some guidance on some of our asterisk growing pains.
Any help is greatly appreciated.

Over the last few months, our call center has grown considerably and
we're now experiencing choppy calls and dropped calls under full
capacity. 

We have around a 60/40 outgoing to incoming ratio

At the moment, we've got the following configuration:
Asterisk SVN-trunk-r7230
All calls recorded to disk
External mysql server for CDR + IVR operations 
Dual Xeon 2.8 4GB Ram (Dell)
Digium TE210P
2 x PRI lines
72 Ploycom 301P SIP phones using ulaw codec

We have a second identical server ready to offset some of the load, but
we're not sure how to balance the sip phones and configuration files
between the two servers.  If we balance the sip registrations between
the two servers, then there's the issues of both servers having to
handle one call via IAX in some situations. 

What kind of experiences, problems and solutions have y'all had when
adding servers to your center?

Should we try to have incoming on one server and outgoing on the other?
Should we have both servers capable of handling all the IVR operations,
so the other server doesn't have to? 
Should we try to have an identical configuration between both servers
and load balance?
What kind of general optimizations should we look at to improve network
/ server performance?
Is there a way to easily register each phone with all asterisk servers,
and have the phone choose a random server to dial, and then be available
as a SIP to each server if it needs to contact it? 
Is it a bad idea to register all phones with each server instead of
distributing registration?

-Here's some of the things we're got planned in the next few days:
-Make sure we have all audio files in all codec formats to reduce the
need for transcoding in IVR 
-Convert all music on hold from mp3 to native codec formats
-Reduce database operations from within extensions.conf
-Upgrade switches on each set of desks to midrange enterprise 100MB
switches with gigabit uplinks, from SOHO netgear 100MB switches 


Thanks,

/mitch
/fidelity reserves

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