You should definitely migrate to BlueStore, that'll also take care of the leveldb/rocksdb upgrade :)
For me mons: as it's super easy to delete and re-create a mon that's usually the best/simplest way to go.
Also, note that you can't immediately continue from Luminous to Nautilus, you have to scrub everything on Luminous first as the first scrub on Luminous performs some data structure migrations that are no longer supported on Nautilus.
Paul
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Paul Emmerich
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