Hi,
This refers to some experimental work codenamed "Europa" that was never added
to the main product. It was an experimental multi-level cluster topology where
only some nodes (the 'core' nodes) were a full part of a cluster, and a number
of extra nodes (lightweight systems such as blades) were linked to the cluster
as subsidiary ('farm') nodes. The name was borrowed from the idea of a "disk
farm". It was being investigated as a way to support very large clusters
without the problems that would arise if 100+ nodes all had to exchange
messages with each other on every cluster transition.
I don't know how much of the related code is present in the OHAC repository, I
presume that it is just the modifications to the core cluster to support the
farm nodes. You can safely ignore it for the moment.
Steve
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