Abstract: An information processing system and method effectively prevents data loss and the like caused by the duplicate execution of commands. A controller writes a command for a device to a corresponding command queue. The device fetches the command from the corresponding command queue. The command includes a field for storing fetch information which indicates whether the command has been fetched. The device refers to a value of the fetch information of the fetched command. If the value of the fetch information is a first value indicating that the command has not been fetched, the device executes the command after updating the value of the fetch information of the command which is stored in the corresponding command queue to a second value indicating that the command has been fetched. If the value of the fetch information is the second value, the device executes predetermined error processing instead of executing the command.

Abstract: A control apparatus, which is configured to control a plurality of processors corresponding to a plurality of storage areas arranged at an interface for accessing the storage areas, comprises: an update unit configured to, in a case a command sequence including each command outputted to one of the storage areas is inputted, update, by each one of the processors, a load applied by a command currently being executed to the storage area corresponding to the processor; a selection unit configured to, for one command of the command sequence, based on a load applied by a command currently executed at the processor updated by the update unit, select a processor out of the processors as an allocation destination of the one command; and an output unit configured to output the one command to the processor selected by the selection unit.

Abstract: A control apparatus, which is configured to control a plurality of processors corresponding to a plurality of storage areas arranged at an interface for accessing the storage areas, comprises: an update unit configured to, in a case a command sequence including each command outputted to one of the storage areas is inputted, update, by each one of the processors, a load applied by a command currently being executed to the storage area corresponding to the processor; a selection unit configured to, for one command of the command sequence, based on a load applied by a command currently executed at the processor updated by the update unit, select a processor out of the processors as an allocation destination of the one command; and an output unit configured to output the one command to the processor selected by the selection unit.

Abstract: An input-output control unit includes: an interface control circuit for controlling data on a frame basis with respect to each of transmitted and received frames; a reception buffer control circuit for transferring receive-data stored in a receive-data buffer to a command issuer; a transmission buffer control circuit for transferring send-data stored in a send-data buffer to an interface; a plurality of protocol control circuits for controlling transfer of the receive-data and the send-data; and a received frame routing control circuit for selecting a location to which the received frame should be assigned, from among the plurality of protocol control circuits, based on control information attached to the received frame received by the interface control circuit and assigning processing on the received frame to the selected protocol control circuit.