OSD don't start after upgrade form 0.47.2 to 0.56.1

in the upgrade process? How can I recover the osds or if not possible, how do I return to a clean state Best regards Michael Menge M.MengeTel.: (49) 7071/29-70316 Universität Tübingen

understanding cephx

can I add/change the mon. key? /etc/ceph/ has keyrings for admin client.admin mds.* ods.* but none for mon. or mon.* Is this correct? Best regards Michael Menge [1] http://www.admin-magazin.de/Das-Heft/2012/03/Der-RADOS-Objectstore-und-Ceph-Teil-1/%28language%29/ger-DE