Storage Controller

Provided is a storage control unit (10) capable of, even when a failure occurs in access from a control unit (20, 30) to storage devices (DRVn) and the access from the control unit to the storage devices is switched to access via an alternate path, continuing I/O access to the storage devices without interrupting I/O requests from a host (70). The present invention provides a storage control unit (10) having dual control units (20, 30) wherein a controller (23, 33) in one control unit, that has received an I/O request from a host, issues an I/O request to an initiator (25, 35) in another control unit using a control path (81) between the controllers in the control units, and the initiator that has received this I/O request accesses the target storage device(s) via a connection path based on that I/O request.