SECONDARY STORAGE INFORMATION SAVING SYSTEM

PURPOSE:To reduce a load on a CPU by previously transferring an intercontroller communication control means in a secondary storage device from the CPU to storing means in respective controllers by a communication control information transferring means in the CPU and executing the transferred means independently of the operation of the CPU. CONSTITUTION:In case of storing the information of a magnetic disk device 3 in a magnetic tape device 5, communication control information is transferred to a magnetic disk control storage 2-1 and a magnetic tape control storage 4-1 based on the function of an I/O control program 1-1 at first to form a magnetic disk control microprogram 2-2 and a magnetic tape control microprogram 4-1, and then both operations, i.e. information reading from the disk device 3 and information writing in the tape device 5 are started. Thus, the information of the disk device 3 is sent and stored to/in the tape device 5 through an intercontroller connecting interface 6 independently of the operation of the CPU 1. Consequently, the load on the CPU 1 can be reduced.