Currently the ceph container only exists on x86_64 so if the first inventory item in the clients group is an x86_64 system pulling the container image will fail and the ceph-install will about. As the keys and config don't differ based in the architecture we can ensure remove ppc64le nodes from the group.
Latest available version is ceph-ansible-3.2.0-1.el7cp from http://access.redhat.com/errata/RHBA-2019:0020