> We want to have one replica per rack and more generally two replicas in > the first DC and one in the other one. > So now we are stuck on the crushmap: how to force the cluster to put two > replicas in the first dc? > Is that related to th bucket's weight? You can fix that in the crush map bucket hierarchy indeed. There is a nice explanation here: http://ceph.com/docs/master/rados/operations/crush-map/ Note that your clients will write in both the local and remote dc so it will impact write latency! Cheers, Robert van Leeuwen
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