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Yes, copy the ring out to the nodes, wait an hour, rebalance, and copy the new ring out.

The reason for this is that only one replica of a given partition will move at a time, and this is done to ensure availability of your data even during a rebalance. To see why, imagine that there were no such protection; if all three replicas of a partition moved in a rebalance, then objects in that partition would be unavailable until the replicators moved the objects to their new homes.