One more newbie question )

I have a minimal working ceph cluster: 3 nodes, 6 OSDs.
I understand that I can scale up cluster adding one or more OSDs or
even nodes without stopping clients i/o and loosing consistency.

What if I decide to add a cache pool backed by SSDs or move a journal to
SSD? Should I stop clients i/o before performing operations of this kind? 

Is there a rule of thumb to determine permitted operations from "online"
client's point of view?
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