[Dovecot] cluster with dsync mirror

[Patrick Domack]

I used a setup like this, to sync mail between 3 different  
datacenters, in a multimaster setup.

For this I used unison, running every 28seconds. And it worked well  
for two years, before I changed to a better approach. Older versions  
of dovecot didn't like the moves very much (pre 1.0), but when I  
upgraded it to 1.0.x versions, it seemed to be happy. I discontinued  
it before 1.1 was out.


Quoting Bryan Vyhmeister <dovecot at bsdjournal.net>:

> I have an idea for running a pair of redundant dovecot mail servers
> that may be odd but it might work. I'm interested in any thoughts on
> the topic.
>
> Would it work to run 'dsync mirror' every minute against either mdbox
> or sdbox mailbox on a dedicated network connection between two (or
> potentially three or four) mail servers? I'm trying to avoid using a
> NAS/SAN or some other dedicated NFS server in a simple environment
> with a limited number of users. Everything else about the systems
> could be identical. Both could receive mail using Postfix with dovecot
> LDA. Thank you.
>
> Bryan
>