Hi, all! I use rbd to do something and find below issue:
when i create a rbd image with feature: layering,exclusive-lock,object-map,fast-diff failed to map: rbd: sysfs write failed RBD image feature set mismatch. Try disabling features unsupported by the kernel with "rbd feature disable". In some cases useful info is found in syslog - try "dmesg | tail". rbd: map failed: (6) No such device or address dmesg | tail: [960284.869596] rbd: rbd0: capacity 107374182400 features 0x5 [960310.908615] libceph: mon1 10.0.10.12:6789 session established [960310.908916] libceph: client21459 fsid fe308030-ae94-471a-8d52-2c12151262fc [960310.911729] rbd: image foo: image uses unsupported features: 0x18 [960337.946856] libceph: mon1 10.0.10.12:6789 session established [960337.947320] libceph: client21465 fsid fe308030-ae94-471a-8d52-2c12151262fc [960337.950116] rbd: image foo: image uses unsupported features: 0x8 [960346.248676] libceph: mon0 10.0.10.11:6789 session established [960346.249077] libceph: client21866 fsid fe308030-ae94-471a-8d52-2c12151262fc [960346.254145] rbd: rbd0: capacity 107374182400 features 0x5 If i just create layering image, map is ok. *The question is here:* Then i enable feature: exclusive-lock,object-map,fast-diff It works. And rbd info shows all feature i set. I think it is a bug: why create with those feature then map failed but map after create is ok? I think it is more than order question. My OS is CentOS Linux release 7.4.1708 (Core), kernel is 3.10.0-693.el7.x86_64. Ceph version is 12.2.2 (cf0baeeeeba3b47f9427c6c97e2144b094b7e5ba) luminous (stable) Thanks
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