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Does a MongoDB replica set require at least 2 or 3 members?

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http://serverfault.com – Documentation here says three: http://docs.mongodb.org/manual/tutorial/deploy-replica-set/ "A replica set requires three distinct systems..." Whereas the documentation here says two: http://docs.mongodb.org/manual/core/replication/ "Most replica sets consists of two or more mongod instances..." Anyone know which is correct? (HowTos)