On Thu, Sep 10, 2015 at 8:55 AM, Richard Dawe <rich.d...@messagesystems.com> wrote:
> So if you have a topology that would change if you switched from > SimpleStrategy to NetworkTopologyStrategy plus multiple racks, it sounds > like a different migration strategy would be needed? > > I am imagining: > > 1. Switch to a different snitch, and the keyspace from SimpleStrategy > to NTS but keep it all in one rack. So effectively the same topology, but > with a different snitch. > 2. Set up a new data centre with the desired topology. > 3. Change the keyspace to have replicas in the new DC. > 4. Rebuild all the nodes in the new DC. > 5. Flip all your clients over to the new DC. > 6. Decommission your original DC. > > That would work, yes. I would add : - 4.5. Repair all nodes. But really, avoid getting in this situation in the first place... :D =Rob
