There is a great guide here on how to add resources: http://www.datastax.com/docs/1.1/operations/cluster_management#adding-capacity
What about deleting resources? I'm thinking of removing a data center. Clearly I'd need to change strategy options, which is currently something like this: {DC1:3,DC2:1} to: {DC1:3}) But, after that change, I'm wondering if anything else needs to happen? All of the data in DC1 is already in the correct spots, so I don't think I have to run repair or cleanup... will