Comment 8 for bug 1430705

Increasing the replication factor is one of the most disruptive events which could ever happen to a ceph cluster.
Even recovering a few failed OSDs, or moving data from full/nearly full OSD, or scrubbing (checking if objects'
replicas are identical) which boils down to copying or moving 5 -- 20 % of the available objects can substantially
reduce the cluster performance. Making an extra copy of every object (as a result of incrementing replication factor)
on a production cluster is a big no-no.

As a matter of fact replication factor, number of PGs, etc, should be planned in advance. Just because it's possible
*in theory* to change these parameters doesn't mean it's easy. I think we should NOT provide a UI for such
dangerous/expensive operations.