Johan> For a project of mine I would like to be able to have more than
Johan> seven machines in a replica set. Is that possible right now? The
Johan> docs says that a cluster can contain 1-7 machines.
It is true, but it is per replica set (a cluster might have several
shards, each being a replica set so ...)
http://www.markus-gattol.name/ws/mongodb.html#is_there_a_limit_on_the_number_of_physical_machines_for_a_replica_set
Can you tell a little bit more about your use case? 7 copies seems a
very high number (even GFS only has 3 copies by default and afaik 5 for
very important data).