On Mon, 2009-07-27 at 10:22 -0700, Seth Mattinen wrote: > Ed W wrote: > > I think there is a whitepaper from Dovecot's current main sponsor > > (before they were called Rackspace) which described their architecture > > using pairs of servers and DRBD between them. Each server is moderately > > loaded and active. If one server fails then half the users don't notice > > and the other half get switched over to what is really their slave server.
The whitepaper is pretty outdated, I don't think we want to show it to people anymore. :) > > Seemed like an elegant architecture... > > > > It's stupidly simple but it works. If you have two spare systems to make > a lab out of you'll be surprised how easy it really is. The only thing I > hate about it is the idle slave hardware just because I feed bad about > powerful machines sitting around waiting for something to happen. Another possibility is to do cross-replication, i.e. server a is replicating to b, and b is replicating to a. The problem with that is that if either one breaks, the other server now handles twice the number of users..
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