Hi everybody, Is it possible with CRUSH map to make a rule that puts R-1 replicas on a node and the remaining one on a different node of the same failure domain (for example datacenter) putting the replicas considering a deeper failure domain (e.g. room)? Statement "step emit" may help in this? Ideally I'm trying to put two of three replicas into same datacenter but in different rooms (or similar) and the remaining one in another datacenter. CRUSH map can do this or it's only achievable with zone/region configuration with rados gw? And it's even possible to specifiy the "primary affinity" in the sense that for specified clients (or for specified pools) ceph has to store the primary replica in the closest (to the client) datacenter and the other replica in another datacenter. Probably for this I will need zones/regions configuration. Cheers, Fabrizio
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