Morning
Am 18.05.2006 um 12:28 schrieb Tariq Rashid:
> So we could place the IMAP proxies closer to the webmail servers -
> before the load balancers. This means that each webmail server must
> be preconfigured to talk to a single IMAP proxy. This way the
> persisted sessions survive through the load-balancers and only one
> session is maintained to the backend real IMAP servers. However,
> the problem with this is that there is reduced resilience - if the
> proxy fails then no users can use that particular webmail server.
>
> (user) ----- [webmail] -- -- -- [IMAP Proxy] -------- <lb> ------
> [IMAP server]
Your design makes good sense, but I would be concerned about how many
connections would effectively be handled at the imap proxy.
Essentially you are introducing a single point of failure into a
normally fault-tolerant/redundant architecture.
We went through somewhat the same problems, and instead of this
approach, we decided to make our webmail product speak maildir, and
gave it direct access to the nas's.
Best of luck.
-Aaron
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