Prospero cannot work across availability zones: so you cannot have a West coast data center and an East coast data center work together. This is, admittedly a rare problem: only a few companies even have a data center these days, but with the advent of services like AWS people want this capability for their systems.
Prospero relies on a distributed database called Mnesia, and Mnesia does not deal well with long delays, such as those you might run across in coast-to-coast operations. In addition Prospero uses RabbitMQ, which also wants all its nodes to be in the same data center. For these reasons, Propero is limited to one data center.
This was a problem. For a mission critical application to go down if you lose one data center is bad. If a hurricane takes down a data center for a week this could be a very bad thing indeed.
We never did come up with a solution, but Miranda is designed for distributed use.
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