Hi guys, I have a Ceph Cluster up and running and cephfs created (all done by ceph-ansible). I following the guide to mount the volume on CentOS7 via FUSE. When I mount the volume as the default admin (client.admin), everything works fine just like normal file system. Then I created a new client just for FUSE mount purpose, follow this guide: https://docs.ceph.com/docs/master/cephfs/mount-prerequisites/ The ceph fs authorize command created a new client with the following caps: [client.wp_test] key = AQDAEc9ebLXjGhAAxEGqTuTvCOoN30g4UzF5jw== caps mds = "allow rw" caps mon = "allow r" caps osd = "allow rw tag cephfs data=cephfs" It can mount the volume, and I can touch a file. But when I tried write data, such as editing a new text or cat a file, I got some read-only error or [root@mon-6-26 ceph_root]# cat test.txt cat: test.txt: Operation not permitted if I modified the OSD cap to "allow *", the it allows write again. Can anyone suggest what have been done incorrectly? We are using 14.2.9 (581f22da52345dba46ee232b73b990f06029a2a0) nautilus (stable) Cheers, Derrick