+================+=============+=============+=============+=============+=================+
| keystone | X | X | X | X | X |
+----------------+-------------+-------------+-------------+-------------+-----------------+
-| glance | file | swift | file | file | swift |
+| glance | rbd | swift | file | swift + rbd | swift |
+----------------+-------------+-------------+-------------+-------------+-----------------+
| cinder | rbd | iscsi | | | iscsi |
+----------------+-------------+-------------+-------------+-------------+-----------------+