> email builder wrote:
> >>email builder wrote:
> >>How much email are you processing ?
> >
> >
> > Well, just the other day we had an average of 48 msgs/min (max 255/min)
> get
> > run
> > through SA. Can't say today yet because can't run our stats tools until
> the
> > busy hours are over cuz SA is hogging the CPU. ;)
>
> Hi,
>
> Your CPU is over loaded. At 48 a minute it should run just ok on a 2.8
> Ghz machine, much over that it's going to start having problems. On our
> 2.4 Ghz (not HT) processor if I process over 35 a minute I start having
> problems with load.
I have two reactions to this:
1) I like the glimmer of hope and the idea that throwing hardware at the
problem can solve it
2) Throwing hardware at problems is usually avoiding fixing the *real*
problem. According to other posters on this list, my load is not excessive
for a modern-day 2.xGHz machine. I will have to re-read some messages, but I
believe responders to my posts on the "[OT] Email Servers" thread quoted
similar machine specs and higher load than me and said they did not have load
problems. I'd love to hear that I am mistaken and that it's just a matter of
too little hardware, but I am skeptical...
> I'd recommend upgrading to a dual server or perhaps putting in a second
> server with round robin DNS (or if you can do it, a load balancer).
We've been thinking about a multiple-machine email solution and have been
wondering about architecture. Since SA seems to be the *only* email server
module that causes us grief (even amavisd-new/clamav is nicer to our
machine!!), and although it seems strange not to go with a separate file
server or database server machine (or to otherwise split up SMTP and IMAP,
etc), I am starting to think (as you suggest) that just adding a separate SA
server is going to get us the biggest performance increase. What are
people's opinions and experience setting up separate/multiple SA servers?
Are there any good links for reading about such setups on the wiki or
anywhere else?
> SA is that CPU intensive, it really is. Maybe try adding RBL's in front
> of the MTA to reduce the number of messages you have to scan, that's
> what we do.
Ha! Yeah, this message rate is *WITH* something like 10 RBL's in Postfix up
front. W/out that, we'd *really* be drowning. :)
Many thanks!
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