I'd like to know if it's possible to start a Ceph cluster with just 1 node, then adding a second one later and at last a third one? I know it wouldn't have any redundancy, but running 3 nodes from the start isn't suitable in my case. I think the problem would be to edit the pool config and pc_num later on (or start with pg_num 150 for 3 nodes even though I'd only have one in the beginning?). Could anyone tell me if this is possible and if so, how? The wiki only describes the setup with a 3 node cluster, but not how to add a fourth one etc.
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