CRUSH on single host

The CRUSH algorithm intends to distribute objects across different hosts, so if you set up all OSDs on the same host, CRUSH will complians. For instance, a Ceph cluster with 3 OSDs on single host will likely get a 65 active, 54 active+degraded, 73 active+remapped state when fresh-deployed, which was supposed to be 192 active+clean.



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