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 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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