Embodiments of the present invention are directed to providing continuously updated completion time and an average completion time information for IO commands on a per-LU, per-target, per-port basis. A computer-controlled system coordinates and controls pharmacy workflow to sequence prescriptions for fulfillment in a most efficient path thereby minimizing a cost function associated with fulfillment of the prescription order. The pass-through mechanism moves the tape to a position where the tape can be removed by a second robotic assembly associated with the second linear tape library string.