HI, Looking deeper at my configuration i see: [root@cephmon03 ~]# ceph osd dump | grep min_compat_client require_min_compat_client firefly min_compat_client hammer It is safe to make: ceph osd set-require-min-compat-client hammer In order to enable straw2? regards I, _______________________________________________ ceph-users mailing list -- ceph-users@xxxxxxx To unsubscribe send an email to ceph-users-leave@xxxxxxx