From: Scott Russell (no email)
Date: Wed Jul 12 2006 - 20:33:16 EDT
Robert Mueller wrote:
>> 1) Server A dies
>> 2) Users are sent to Server B via DNS redirects
>> 3) Server A is restored
>> 4) Mailboxes on Server B are now more 'current' than mailboxes on
>> Server A
>>
>> In other words, the failover is easy(ish) but the failback has me
>> scratching my head. I Think two way replication solves that.
>
> Once you've got Server A back, you have to make sure that when you
> start it you've disabled the sync_client and all IMAP/POP/LMTP
> connections to Server A, otherwise if you have things happening to
> both of them at the same time, you'll be in big trouble since there
> won't be an "authorative" server anymore.
>
> Before you change back to the original setup, you have to change the
> configuration so that Server B has a sync_client and Server A has a
> sync_server, and run replication back the other way until all the
> mailboxes on Server A are back up to date with the contents of Server
> B (and probably for safety do a sync_client -u on each user), then
> switch over back to the original setup.
Interesting. This process also implies you want to stop incoming mail
for a period of time to both servers. Sound right?
-- Scott Russell <> IBM Linux Technology Center, System Admin ---- 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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