If you want to change RF on a live system your best bet is through DC
migration (add another DC with the desired # of nodes and RF), and migrate
your clients to use that DC. There is a way to boot a node and not join the
ring, however I don't think it will work for new nodes (have not
confirmed), also increasing RF in this way would only not be completely
catastrophic if you were increasing RF to N (num nodes).​

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