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According to the docs:
http://mongodb.github.io/node-mongodb-native/api-generated/db.html
http://mongodb.github.io/node-mongodb-native/api-generated/replset.html
The replica set options should be used as a parameter for ReplSet, not Db (which uses options, not replica set options). Also it looks like ReplSet is now being used instead of ReplSetServers:
mongodb/node-mongodb-native#937