Need advice on building a Cyrus IMAP cluster

[Vincent Fox]

Michael Sims wrote:
>
> Quick question on this.  If I setup an active/passive cluster and put the
> mail spool AND all of the application data on a SAN that both nodes have
> access to (not simultaneously, of course), doesn't that bypass the need for
> using "mupdate_config: replicated"?  Thanks...
>   
This is the setup we run, works fine.

At the time we installed we were leery of the Murder
architecture anyhow with mupdate server as a single
point of failure.

There are some denigrate active/passive cluster as "wasteful" of
hardware, but frankly hardware is cheap and usually the people
who bring it up are BEAN-COUNTERS who will claim ignorance of
decisions when the critical service is hosed.  I find it difficult
to conceive a modern system can be overwhelmed such
that there's any meaningful benefit to active/active.  I like
the active/passive configuration because we can patch the
idle node, then switch to it, and if patching broke
something we switch back no big deal.

Our mail store are ZFS on double-path SAN switches and
we've had zero unexpected hardware downtimes despite
various hardware failures.


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