From: David Korpiewski (no email)
Date: Tue Jun 06 2006 - 16:04:16 EDT
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
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