Replicate to more than one replica?

[Martin Schweizer]

Hello David

I'm interessted about your backup concept. In next few weeks I will
also bring up a replica (to our single cyrus imad). How you take
"diffs". You can point me to right direction?

2006/6/6, David Korpiewski <davidk at cs.umass.edu>:
>
>
> Wesley Craig wrote:
> > On 06 Jun 2006, at 13:56, David Korpiewski wrote:
> >> Is it possible for one master to rolling replicate to more than one
> >> replica?   I'd like to have one master and two replicas.
> >
> > Can you share why you're interested in two replicas?
> >
> > :wes
>
>
> Sure.
>
> We have one master with two replicas.
>
> The greatest fear here is losing any new email.  So we came up with a
> concept of having a master, an "active replica" (which will take over
> from the master if the master dies), and a "silent replica".
>
> When the master goes away, the "Active replica" becomes our primary mail
> server, the "silent replica" just sits there and does nothing.
>
> When we bring the master back up we make sure cyrus is turned off. Then
> we do a full mailstore diff on the original master and the silent
> replica.  This will give us a list of the email that was not propagated
> when the master went down.   This diff should be showing us the email
> that is not on the current mail server based on the assumption that the
> two replicas were being updated at the same time.  Then we just find a
> way to send over that email and we should be all set.
>
> This is technically easier than trying to reconstruct from the logs what
> was not propagated, especially since I've found the log files to be not
> very informative even in verbose mode.
>
> -David
>
>
> --
> --------------------------------------------------------
> David Korpiewski                     Phone: 413-545-4319
> Software Specialist I                Fax:   413-577-2285
> Department of Computer Science       ICQ:   7565766
> University of Massachusetts Amherst
> --------------------------------------------------------
>
> ----
> Cyrus Home Page: http://asg.web.cmu.edu/cyrus
> Cyrus Wiki/FAQ: http://cyruswiki.andrew.cmu.edu
> List Archives/Info: http://asg.web.cmu.edu/cyrus/mailing-list.html
>


-- 
Martin Schweizer
schweizer.martin at gmail.com
Fax: +1 619 3300587
Tel.: +1 619 3300597 (VoIP)