Authentication is the main thing to be aware of (no data rebuild), but full notes here: http://docs.mongodb.org/master/release-notes/2.6-upgrade/ http://docs.m

Authentication is the main thing to be aware of (no data rebuild), but full notes here: http://docs.mongodb.org/master/release-notes/2.6-upgrade/ http://docs.mongodb.org/master/release-notes/2.6-upgrade/ And, you have to be on 2.4 first (I know you said you are, but best to make sure for others)