I am not going too much into the topic itself, just a few more general questions at first.

Joachim Draeger wrote:
Cluster

Imap is quite resource intensive.

Is it? Why?
How does IMAP resource consumption compare to already existing James parts like POP3 and UserRepositories?

I would have guessed think that the resource consumption is not depending on the protocol in the first place, but on the number of users, the number of transmitted emails and the size of those emails.

This requires to share the load
between multiple hosts. Another goal is being fault tolerant and to have
a fail-over strategy. This means not having 99.999% availability. This
could be done using a cluster capable RDBMS. At the best this would mean
that you can setup your IMAP servers like accessing one single database.

Are you still talking about James at this point or some specialized IMAP server apart from James?

Clustering at DB level would mean to not support dbfile, file and other types of repositories.

  Bernd

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