[Web-cyradm] Postfix, Cyrus IMAP - redundancy.

[Eric Brunson]

Dave Braford wrote:
> I hate to start this discussion, but, I must.
> We have a small office(50 humans), with a current working RH9 based 
> Postfix, Cyrus IMAP install.
> Works great, love it.
>
> I need to build a simple (2) server cluster (if applicable), based on 
> the current setup.
> I realize we'll need to get up to at least Fedora (x), but, what do I 
> do about the mailstore?
> NFS won't work, SAN introduces a single-point of failure.....you get 
> the idea.
> Any ideas for a 'live' fail-over with Cyrus? Murder is murder, and 
> takes at least (3) machines, right(?)
> How about a RANC? Remember that one? Perdition seems to also need more 
> than (2) machines.

I do it with a combination of rsync, heartbeat and IP takeover.  It 
leaves a window of opportunity for mail lossage, depending on the 
frequency of rsync (I do it hourly), but I'm willing to live with that.  
You could replace rsync with RedHat's GFS, but I've never messed with it.

>
> MTA redundancy is pretty easy, no worries there.
> MySQL can be clustered pretty easily.
> I just can't find much out there on mailstore replication or mirroring 
> for a small install.
> Any insight would be greatly appreciated.
>
> --Dave Braford
> Information Technology
> Hanon McKendry Advertising
> 616-776-1111
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