ceph 10.2.x rbd 错误一例

ceph 10.2.x rbd map 错误一例：

rbd: sysfs write failed
RBD image feature set mismatch. You can disable features unsupported by the kernel with "rbd feature disable".
In some cases useful info is found in syslog - try "dmesg | tail" or so.
rbd: map failed: (6) No such device or address

解决方案：

rbd info vm-128-disk-1
rbd image 'vm-128-disk-1':
        size 102400 MB in 25600 objects
        order 22 (4096 kB objects)
        block_name_prefix: rbd_data.95a882ae8944a
        format: 2
        features: layering, exclusive-lock, object-map, fast-diff, deep-flatten
        flags:

其实就是kernel-rbd 对这些属性不支持，

根据网上案例，配置rbd_default_features = 3 ，测试无效。

因而有了终极武器：

rbd feature disable   vm-128-disk-1  exclusive-lock, object-map, fast-diff, deep-flatten

查看：

rbd info vm-128-disk-1
rbd image 'vm-128-disk-1':     

 size 200 GB in 51200 objects
        size 102400 MB in 25600 objects
        order 22 (4096 kB objects)
        block_name_prefix: rbd_data.95a882ae8944a
        format: 2
        features: 
        flags: 

再进行rbd map vm-128-disk-1 ,ok 问题解决