In some cases useful info is found in syslog - try "dmesg | tail" or so. rbd: map failed: (6) No such device or address 1. 2. 3. 4. 5. 在215上映射foo出现报错,查看日志 [8961646.895022] rbd: p_w_picpath foo: p_w_picpath uses unsupported features: 0x3c [8961670.609930] libcep...