Electrical computers and digital processing systems: memory – Storage accessing and control
Reexamination Certificate
2005-05-10
2005-05-10
Gaffin, Jeffrey (Department: 2182)
Electrical computers and digital processing systems: memory
Storage accessing and control
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
06892268
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 I/O 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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Fukuzawa Yasuko
Nakano Toshio
Yamamoto Akira
Antonelli Terry Stout & Kraus LLP
Gaffin Jeffrey
Hitachi , Ltd.
Nguyen Tanh
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