To firmly hold a high-voltage wire apart from its surroundings, and hold some nearby lead wires apart from the high-voltage wire, a wheel-like wire holder includes a ring, a central hub, and a plurality of spokes connecting the central hub to the ring. The subatmospheric pressure mechanism includes a housing having a control unit adapted to draw a vacuum and a canister associated with the housing. The steerable guide catheter has a first extension tube and a second extension tube that are joined together and form a shoulder. Sending the notification regarding the event includes sending the notification to the second party. An external manager communicates with two or more disk array controllers, gathers and manages the access data and the configuration data relating to the physical drives and logical volumes of each disk array controller, and prepares an optimum data migration instruction to equilibrate the access load.