SD Storage

Ceph  storage ( use thru library / RBD remote block devis ) KVM has   ( use for contrail / Openstack Glance and cinder)

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.