Access control apparatus and access control method

An access control method comprising:

• in response to an access request to a storage device, outputting, by a processor, an access command through a first path to a first controller among a plurality of controllers that control the storage device, the access command being a command to access the storage device;
• when no response to the access command to the first controller is received before a predetermined time passes after the output of the access command, controlling, by a processor, a second controller different from the first controller among the plurality of controllers through a second path coupled to the second controller such that the second controller sends a cancel command to the first controller, wherein the cancel command indicates stopping processing executed by the first controller according to the access command;
• outputting, by a processor, the access command through the second path after receiving a response to the control on the second controller, and
• outputting a stop command including information indicating the first controller to the second controller through the second path, thereby allowing the second controller to stop the processing executed by the first controller according to the access command.