[Dovecot] High Availability strategies

[Seth Mattinen]

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.
> 
> 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.

~Seth