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Date:      Mon, 25 Mar 2002 15:38:34 -0800
From:      Terry Lambert <tlambert2@mindspring.com>
To:        Brad Knowles <brad.knowles@skynet.be>
Cc:        Dag-Erling Smorgrav <des@ofug.org>, Taylor Dondich <thexder@lvcm.com>, chat@freebsd.org
Subject:   Re: qmail (Was: Maintaining Access Control Lists )
Message-ID:  <3C9FB4FA.6956C219@mindspring.com>
References:  <F61GQUEYvZmDvHbYxPo0000a6bd@hotmail.com>	 <20020323002608.B20699@rain.macguire.net> <3C9C84CF.2090300@flash.net>	 <20020323084327.A354@rain.macguire.net> <3C9DF87D.5050306@cream.org>		<p05101505b8c430e28572@[10.0.1.9]>	 <000c01c1d3ab$6d2c6960$6600a8c0@penguin> <xzp3cyo7rbu.fsf@flood.ping.uio.no> <3C9F1EF6.CB28EDD7@mindspring.com> <p05101518b8c50f61a513@[10.0.1.8]>

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Brad Knowles wrote:
[ ... Per domain mail queues ... ]
> >  If you do wedge them in, then on an ETRN/ATRN, you are
> >  guaranteed a 100% hit rate on queue messages, instead of
> >  just the percentage of the main queue of the messages for
> >  a particular domain.
> 
>         Indeed, that is a problem.  And if you get 50-60 ETRN requests
> per second (as our business-class mail server was getting), this
> causes untold amounts of unholy hell.

With them in place, we handled as much email as Best Internet's
primary list server handled in a month in just under 48 hours,
on one 166 MHz dual processor PPC box (our test box), with
10,000 virtual domains, 5,000 using ETRN/ATRN, and 5,000
acting as "queue-only" only in the case of an outage of the
primary mail server for the domain.  That's over half a million
10k messages every 24 hours.

We believed that our final deployment would scale at 50,000
virtual domains per node, all using ETRN/ATRN.  At that point,
it was all about FS latency, which was much lower on a journalled
FS with btree directory structure than it would be on FreeBSD.

Gotta love sendmail...  8-) 8-).

-- Terry

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