Convergence and mshttpd general question

I've seen suggested on several posts here on this forum and from other Sun engineers that the mshttpd Webmail process should (must?) be run on the same server as Convergence. I didn't find this anywhere in the documentation for Convergence, so if it is there and I missed it, please point out where I overlooked it. For our Comm Suite 7 set up, we had provisioned 4 mail multiplexors (that run mshttpd), 4 mail message stores, and 2 Convergence front-end boxes. Our environment was officially approved by Sun Professional Services, so if this mshttpd/Convergence factor is so important, why wasn't it pointed out to us by S.P.S? Also, why does the Convergence setup let you specify a different hostname for the Web Mail server?
Thanks,
Jim

JimBuitt wrote:
I've seen suggested on several posts here on this forum and from other Sun engineers that the mshttpd Webmail process should (must?) be run on the same server as Convergence.The webmail process does not have to run on the same server as Convergence.
I didn't find this anywhere in the documentation for Convergence, so if it is there and I missed it, please point out where I overlooked it.http://wikis.sun.com/display/CommSuite7/Communications+Suite+7+Installation+Scenario+-+Convergence
<snip>
Recommended:
* Webmail Server component of Messaging Server 7 Update 2
We recommend that you install the Webmail Server on this host.
About Webmail Server
The best deployment practice is to place the Webmail Server on the same host as Convergence to provide horizontal scalability and enable smooth growth of services.
Note: From a functional perspective, Convergence provides complete mail service when the Webmail Server is located on a different host than Convergence. Therefore, in some deployments, the Webmail Server may be located on a different host.
Other Messaging Server components such as the message store and MTA, Calendar Server, and Instant Messaging Server may be located on other hosts.
</snip>
So whilst you can run the webmail processes on another system, you need to consider the value (CPU offloading) vs. the cost (network delay, additional point-of-failure). The webmail process doesn't consume much CPU resources compared to Convergence.
For our Comm Suite 7 set up, we had provisioned 4 mail multiplexors (that run mshttpd), 4 mail message stores, and 2 Convergence front-end boxes.Is there any documentation that has the webmail processes (used by Convergence) running behind a load-balancer? I can imagine a few scenarios where this will cause problems:
=> If a user session is processed by different front-ends then there may be synchronization issues e.g. an email marked "Read" in one webmail instance may be "Unread" in another.
=> The webmail services keep IMAP connections open for active sessions (where a logout hasn't occurred/session hasn't timed out). If Convergence is accessing different webmail front-ends for the same user then you could have multiple webmail sessions subsequently additional webmail => IMAP connections.
=> If you have a single problem webmail instance it will impact all Convergence front-ends "randomly" vs. having a single Convergence front-end failing all the time. The second scenario is much easier to diagnose/isolate.
In general it comes down to this -- don't make your environment more complex then it needs to be.
Regards,
Shane.

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