Date: Fri, 17 May 2002 09:53:12 -0400 From: Lord Raiden <raiden23@netzero.net> To: freebsd-questions@FreeBSD.ORG Subject: mirroring servers Message-ID: <4.2.0.58.20020517094451.00954760@pop.netzero.net>
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HI all. I've heard of this being done before but I wasn't sure how. Basically what I'm curious of is how to mirror two servers. The general idea of the two servers is to be exact copies of each other. Both will be hidden behind a redirector. Both servers will perform file serving and storage tasks and no matter which of the two servers you login to on any given morning, or which of the two servers the redirector hands you off to, each server should have an exact copy of what is on the other one, no matter how many changes have been made on its twin. Now I've seen this done before and they evidently used file dates and version numbers, or something plus some sort of changelog, kind of like what's used on a database to track changes. So then if something on one of the servers is updated, the twin is immediately notified, and recieves the changes accordingly. But say for example someone edits a file on server A, then not more than 5 seconds later, someone edits the same file on server b. Since that's the newer file now, the file on server b becomes the dominant host file, and is immediately cloned to server A regardless of the fact that the file on A has changed also. So, I hope this is enough of a description for you. Can someone tell me where or how I could find out about doing these? I'm looking at possibly having to implement this in the near future. Our Noc is starting to have growing pains. =) [drat, and just after I nicely got done consolidating. sheesh] To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message
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