DATA MEMORY SYSTEM HAVING MESSAGE NETWORK PROVIDED WITH PLURAL DIRECTORS ON SEPARATED DATA TRANSFER PART AND COMMON CIRCUIT BOARD

PROBLEM TO BE SOLVED: To provide a data memory system, having a redundant configuration for protecting an entire system from a fault, in the case of the fault in a component. SOLUTION: This system is provided with a data transfer part, having a cache memory together with a system interface having plural first and second directors and a crossbar switch, having an input/output port coupled to such first and second directors higher than first and second director boards and a pair of output/input ports. The cache memory is coupled to the plural first and second directors. A message network is provided, and such a network is operated independently of the data transfer part. Data pass through the cache memory inside the data transfer part.