A transcritical vapor compression system includes a fluid circuit circulating a refrigerant in a closed loop. The male articulating member may optionally be mounted either removably in its housing of the frame to enable the stopper to be extracted from the frame in its upright position or secured in its housing such that the stopper is not detachable from the frame. The cassette also forms an impulse chamber with a nozzle leading therefrom. At least two of the controllers at the plurality of storage locations present their implemented LUN as an active device to the one or more host systems for receiving operational data access requests.