To change storage engine to WiredTiger, you will need to manually export and upload the data using mongodump and mongorestore. But you can do it for members of

To change storage engine to WiredTiger, you will need to manually export and upload the data using mongodump and mongorestore. But you can do it for members of a replica set separately. http://docs.mongodb.org/master/release-notes/3.0-upgrade/ http://docs.mongodb.org/master/release-notes/3.0-upgrade/