[rch]

Yokozuna and CS (or plain Riak) use different backend configurations[0,1]. So beyond having physically distinct clusters, you'd get to have purpose optimized storage, but with a common management regime.

[0] http://docs.basho.com/riak/latest/ops/building/planning/back...

[1] http://docs.basho.com/riakcs/latest/cookbooks/configuration/...