Currently I am checking usage on ssd drives with 

ceph osd df| egrep 'CLASS|ssd'

I have a use % between 48% and 57%, and assume that with a node failure 1/3 
(only using 3x repl.) of this 57% needs to be able to migrate and added to a 
different node.

Is there a better way of checking this (on old Nautilus)?


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