Patent ID: 7526592

Claim:
A storage control system having a controller for controlling information exchange between an information processing apparatus and a storage apparatus, the controller comprising: a first sub-controller for controlling information exchange between the controller and the information processing apparatus and also between the controller and the storage apparatus; a second sub-controller for controlling the first sub-controller; and a third sub-controller for controlling information exchange between the first sub-controller and the second sub-controller, wherein the third sub-controller has an interrupt conversion unit for converting a message signal interrupt issued from the first sub-controller to the second sub-controller into an interrupt signal, and outputting the converted interrupt signal to the second sub-controller, and when the third sub-controller receives a command to clear an interrupt from the second sub-controller, a predetermined value is written to an intpass address in a memory thereof upon the clearing of the interrupt, and the second sub-controller initializes the intpass area before commanding the interrupt conversion unit to clear the interrupt, checks whether that the intpass address has been updated or not after sending the command to clear the interrupt, and thereby determines that interrupt-conversion by the third sub-controller has been completed.