Date: Mon, 29 Oct 2001 14:44:37 -0500 (EST) From: Francisco Reyes <lists@natserv.com> To: rcollins@hwi.buffalo.edu Cc: questions@FreeBSD.ORG Subject: Re: redundant mail servers Message-ID: <20011029143732.C51234-100000@zoraida.natserv.net> In-Reply-To: <1868.141.149.144.170.1000640220.squirrel@claven.hwi.buffalo.edu>
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On Sun, 16 Sep 2001 rcollins@hwi.buffalo.edu wrote: > I'm looking to implement redundant mail servers. Load balancing would be > *very nice* considering the cost of the hardware, but redundancy is the > requirement. Coming a bit late to the thread.. Forget about load balancing. Too expensive to do it correctly. One way to go about it: --Get yourself two machines, preferabley with SCSI since those drives are more reliable. One will be your primary and the other your backup --On each machine get 2 drives with removeable trays. 1 for OS second for mail. Configure the machines simmilarly so you could mount your mail on either machine. --Run Rsync or Unison every 10 minutes from your primary machine to the backup. If your primary dies move the data drive to the second machine and change it's IP. If the primary Mail drive dies, move the mail disk from the second machine to the primary machine. Variations of this setup can get you even more redundancy such as getting RAID instead of just single drives for the data drives. You should also consider whether your pop program may have a problem with rsync/unison when copying the data. We are working on preparing something simmilar to what I described above and we are going with a commecial program called communigate Pro. We were told that we should have no problems copying the data to the secondary machine. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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