At 3:40 AM +0100 12/9/05, Christian Enqvist wrote:
We are about to setup a secondary mailserver hooked up to our
OD-master (10.4.3). We got about 70% of our users using IMAP.
OK, normally by "Mail server" you mean MTA, or SMTP host and
secondaries are just another server that is set to relay mail to your
primary, accepting mail for your primary and queuing it if it's down.
This is accomplished with MX records and permitting relays for the
domains in question. The "secondary" accepts mail and retries until
the primary is available to accept the mail.
What i
need som help with is to understand the use of a secondary mailserver
in a IMAP-enviroment (yeah, please flame away).
OK, this is a very, very different thing, as now you're talking about MDAs.
These aren't really "secondaries" (vs primaries) at all in the MTA or
SMTP sense, but are servers that simply are capable of doing your
IMAP (or POP) for the user. You often use some sort of HA
architecture along with them, so you can load balance between them or
fail over to a standby host when one fails.
If the first one goes
down and they log in to the secondary mailserver there wont be a
single mail there, right?
Well this depends.
The way you would prevent this from happening is to use a
multi-tiered architecture so that the user mail stores aren't on a
failing server but on some other shared storage, like on NAS or SANs.
--
-dhan
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Dan Shoop AIM: iWiring
Systems & Networks Architect http://www.iwiring.net/
email@hidden http://www.ustsvs.com/
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iWiring provides systems and networks support for Mac OS X, unix, and
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