Ceph storage ( use thru library / RBD remote block devis ) KVM has ( use for contrail / Openstack Glance and cinder)
Gluster Gluster ( network file system / NFS or Samba )
Ceph is a unified, distributed storage system designed for excellent performance, reliability and scalability.
Gluster is a distributed file system which allows you to create a single storage volume spanning multiple hosts.