I have a cluster with 5 keyspaces. I would like to move one of the keyspaces to a separate cluster because it has very different usage patterns that can be optimized on different hardware.

What would be the best way to do that online ie. without interrupting reads & writes. The keyspace is about 350GB on each of the 3 nodes.

Running cassandra 1.1.12, not upgrading to 1.2.x for now.

Thanks