Either you can use it as Ephemeral Disk or we can add it in Cinder .

For using it as Ephemeral Disk we need to mount the Lun to /var/lib/nova/instances and cluster it with GFS or any other compatible File system. www.adminz.in/2014/11/gfs-storage-clu...

or Else we can mount the Lun to a Server and run cinder Volume service to make use of that disk.Once we configure cinder Service we can use it as Volumes just like EBS Volumes in Aws