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+====================
+Multiple attach volume
+====================
+
+
+Use Case
+--------
+Since multiple volume attaching support to OpenStack Mitaka, one volume can be attached to several
+instances or hosts, rally should add scenarios about multiple attach volume.
+
+
+Problem Description
+-------------------
+Rally lack of scenarios about multiple attach volume
+
+
+Possible solution
+-----------------
+* Add nova scenarios "multi_attach_volume" and "multi_detach_volume"