One word of caution: there is one known upgrade issue if you

 - upgrade from luminous to nautilus, and then
 - run nautilus for a very short period of time (hours), and then
 - upgrade from nautilus to octopus

that prevents OSDs from starting.  We have a fix that will be in 15.2.1, 
but until that is out, I would recommend against the double-upgrade.  If 
you have been running nautilus for a while (days) you should be fine.

sage


https://tracker.ceph.com/issues/44770
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