Communications system/method from host having variable-length fo

Details Communications system/method from host having variable-length fo Communications system/method from host having variable-length fo

1998-04-01

2000-08-01

Lee, Thomas C.

Electrical computers and digital data processing systems: input/

Input/output data processing

Peripheral adapting

710 3, 710 4, 709200, 709217, 709245, 709246, 711221, G06F 1300, G06F 300, G06F 1200, G06F 1516, G06F 1312

Patent

active

060981296

ABSTRACT:
In 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 one disk connected to the I/O subsystem B in a magnetic tape 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 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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