A path controller controls a plurality of paths, including switching between those paths in response to an error notice. Upon detection of a path connection timeout at the path controller, a target driver submits an I/O abort request to a disk array device. The target driver also forwards an error notice to the path controller when it is received. A Fiber Channel driver controls a Fiber Channel adapter. In response to an I/O abort request submitted by the target driver, the Fiber Channel driver blocks every operation on the disk array device, as well as sending an error notice to the target driver.