Patent ID: 6098129
Filing Date: 2000-08-01
Classification: G06F

Abstract:
A heterogeneous computer system comprising:a first host computer;a first I/O subsystem connected by an interface of variable-length record format to said first host computer and including at least one external memory;a second host computer;a second I/O subsystem connected to said second host computer by an interface of fixed-length record format and including at least one external memory; anda communication unit for connecting said first I/O subsystem to said second I/O subsystem;wherein said first I/O subsystem includes:a table for storing a device address of an external memory, data indicating one of said first I/O subsystem and said second I/O subsystem to which said device address is assigned, and a device address of said external memory in said second I/O subsystem when said device address is assigned to the external memory of said second I/O subsystem: anda means for receiving from said first host computer a first read/write request conforming to said interface of variable-length record format including the address of the external memory to be read from or written into, and upon decision, with reference to said table, that said address of said external memory included in said first read/write request is assigned to the external memory included in said second I/O subsystem, converting said first read/write request into a second read/ write request conforming to said interface of fixed-length record format and sending said second read/write request to said second I/O subsystem.