Heterogeneous computer system, heterogeneous input/output...

Electrical computers and digital processing systems: memory – Storage accessing and control

Reexamination Certificate

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C710S003000, C710S008000, C710S009000, C710S020000, C710S036000, C710S038000, C710S268000, C709S200000, C709S201000, C709S217000, C709S218000, C709S238000, C709S245000, C709S250000, C711S111000, C711S112000, C711S200000, C711S202000, C711S205000, C711S206000, C711S207000, C711S211000

Reexamination Certificate

active

06871255

ABSTRACT:
A heterogeneous computer system, a heterogeneous input/output system and a data back-up method for the systems. An I/O subsystem A for an open system and an I/O subsystem B for a mainframe are connected by a communication unit. In order to back up data from at least a disk connected to the I/O subsystem B in a MT library system and in order to permit the mainframe to access the data in the I/O subsystem B, the I/O subsystem A includes a table for assigning a vacant memory address in a local subsystem to the memory of the I/O subsystem A for an open system. A request of variable-length record format received from the mainframe is converted into a fixed-length record format for the subsystem B. The disk designated according to the table is accessed, and the data thus obtained is sent to the mainframe and backed up in the back-up system.

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