Storage control system

A storage control system constructed in an enclosure, comprising:

• a plurality of storage devices;
• a storage device control unit that controls read/write operations against the storage devices;
• a plurality of scale-out Network Attached Storage (NAS) heads each comprising a first processor;
• a scale-up NAS head comprising a plurality of second processors;
• a storage connection section which connects said storage devices via said storage device control unit to each of said scale-out NAS heads and said scale-up NAS head;
• and
• a server connection section which connects each of said scale-out NAS heads and said scale-up NAS head to each other,
• wherein said plurality of scale-out NAS heads and said scale-up NAS head convert file input/output (I/O) commands from a host computer to block I/O commands which are sent via said storage connection section to said storage device control unit which controls read/write operations of the storage devices,
• wherein said scale-out NAS heads and said scale-up NAS head exchange interserver messages between each other via said server connection section,
• wherein said interserver messages include an inquiry message sent from a first NAS head to a second NAS head inquiring of information from said second NAS head and a response message sent from said second NAS head to said first NAS head responding to said inquiry message,
• wherein a number of paths forming said server connection section is larger than a number of paths forming said storage connection section,
• wherein a data transfer bandwidth of each path in said storage connection section is wider than a data transfer bandwidth of said server connection section,
• wherein said plurality of scale-out NAS heads operate as web servers, and
• wherein said scale-up NAS head operates as a database server.