Comment 15 for bug 1728739

I am facing this issue in kernel version: "4.4.0-104"

root@cc-swi01-tky1:~# uname -r
4.4.0-104-generic

root@cc-swi01-tky1:~# ceph --version
ceph version 12.2.2 (cf0baeeeeba3b47f9427c6c97e2144b094b7e5ba) luminous (stable)

root@cc-swi01-tky1:~# sudo rbd create image01 --size 1024 --pool testpool

root@cc-swi01-tky1:~# rbd ls -p testpool
image01

root@cc-swi01-tky1:~# sudo rbd map image01 --pool testpool --name client.admin
rbd: sysfs write failed
In some cases useful info is found in syslog - try "dmesg | tail".
rbd: map failed: (110) Connection timed out

# dmesg | tail
[516822.815270] libceph: mon0 10.X.8.201:6789 feature set mismatch, my 106b84a842a42 < server's 40106b84a842a42, missing 400000000000000
[516822.842737] libceph: mon0 10.X.8.201:6789 missing required protocol features