Why Lotus Domino's application layer shared-nothing active/active clustering model is such a huge competitive differentiator...
Microsoft advises staying away from active/active clusters though, and imposes some serious limitations on them in order to avoid potential disaster -- and with good reason.In contrast, let's review:
For starters, an active/active cluster is limited to two nodes. If you want more than two nodes, you will have to use the active/passive configuration. If you are running an active/active cluster, you must never have more than 1,900 simultaneous connections to a node, and the individual CPUs must never exceed 40% capacity for more than 10 minutes at a time. Otherwise, bad things can happen.
Lotus Domino can have a six-way active-active cluster, across operating systems, versions of Domino, physical locations, and without a single point of failure.
Link: SearchExchange: Exchange Admin 101: An introduction to Exchange clustering >
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Raj | 6/7/2005 6:07:45 PM
It has to be said that while Exchange is a pig there does seem to be a much much much bigger support community surrounding it. Plenty more tutorials, walkthroughs and articles to help the budding Exchange admin (lets face it they need all the help they can get).
It'd be great if there was more help (notes.net is excellent but its more a discussion forum than a tip/howto site) available for Lotus admins.
. . . . and the CPU load and number of active users has nothing to do with whether or not a server is clustered.