Description of problem: RH Ceph Storage must be compatible with the current version of RHEL 7 (7.4 at the time of this writing.) ceph-iscsi-ansible has a OS check for RHEL 7.3. This check should be set to RHEL 7.4. Version-Release number of selected component (if applicable): ceph-iscsi-ansible-1.5-5.el7scon.noarch.rpm