On Wed, Jan 28, 2009 at 12:39:01PM +0100, Rocco Scappatura wrote:
> I have a mail gateway system that consists of several
> Postfix+MySQL+Amavisd-new machines behind a load balancer.
>
> I have defined a balancing policy based on number of SMTP sessions that
> every server has to manage.
New connections are given to the server with the fewest connections?
> But, even if the session is perfectly balanced, I see that the average
> latency of a message in Postfix queues is too high on some machines and
> quite zero on other.
Are the same servers overloaded over a long period of time? And lightly
loaded servers remain lightly loaded?
What is the critical resource? Disk I/O? CPU? Output concurrency?
> What I infer is that every session can be used to devilver/send
> different email messages (other then every message as inerently a
> different size).
>
> It is right my argument or Im wrong in something? If yes, has Postfix
> the control of the number of message that could be manage by each SMTP
> session?
Take a look at "qshape", is there a lot of deferred mail on some systems
and not others? Are you doing recipient validation, or accepting and
bouncing a lot of mail?
--
Viktor.
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