Default backend je BlueStore, t.j. ten, co chce cely disk. Ano, je mozne pouzit starsie backendy, ktore ukladaju do vymenovanych filesystemov, ale preco?
Zdovodnenie preco BlueStore mozno najst v "File Systems Unfit as Distributed Storage Backends: Lessons from 10 Years of Ceph Evolution", https://dl.acm.org/doi/10.1145/3341301.3359656