tl;dr Do not "ceph osd rm" an OSD before "ceph osd crush rm"ing it Sage's explanation: https://github.com/ceph/ceph/pull/13732/commits/1f4feb861876e8d997401088c285b70aa2f1ee1a -- Nathan Cutler Software Engineer Distributed Storage SUSE LINUX, s.r.o. Tel.: +420 284 084 037