On Fri, Nov 12, 2010 at 02:02:01PM -0500, Ron Vachiyer wrote: > > > > > Hello, > > I am currently investigating the possibility of adding a second cyrus server, > the goal being to entirely duplicate the mailspool/userbase and have users > POP in some sort of balanced means, either DNS load balancing or otherwise. > We have a pool of inbound MX servers that handle email, delivering to Cyrus > over lmtp. In the event of a crash, we would want to repair/rebuild the dead > server and have it re-join the pairing. > > I have read on this list's archives that having user interaction on two > replicated servers is iffy, and I wonder what the point is, or is there > alternative documentation/methods I should be considering to do this. If it > is true that popping email off of two servers set up in replication is a bad > idea, I wonder what the point of it really is?
It's getting better, but it's still not 100% reliable to have master/master replication between two servers with interactions going to both sides. It SHOULD be safe now to have a single master/master setup with individual users on one side or the other - but note that nobody is known to be running that setup successfully yet. As for what the point is? I don't know about you, but I run a 24hr/day shop, and I like to be able to take a server down for maintainence in about 2 minutes, with users seeing a brief disconnection and then being able to keep using the service with minimal disruption. Bron. ---- Cyrus Home Page: http://www.cyrusimap.org/ List Archives/Info: http://lists.andrew.cmu.edu/pipermail/info-cyrus/
