Is Ceph possible to handle hardware RAID arrays (LUNs) as OSD drives?
Solution 1:
You can doesn't mean you should. Mapping RAID LUNs to Ceph is possible, but you inject one extra layer of abstraction and kind of render at least part of Ceph functionality useless.
Similar thread on their mailing list:
http://lists.ceph.com/pipermail/ceph-users-ceph.com/2017-September/021159.html