Heterogeneous computer system, heterogeneous input/output system and data back-up method for the systems
First Claim
1. A computer system comprising:
- a first storage system comprising a first disk controller, and one or more first disks coupled to said first disk controller;
a second storage system comprising a second disk controller, and one or more second disks coupled to said second disk controller; and
a controller coupled to said first storage system, said second storage system, and a host computer, wherein said controller receives an I/O request issued from said host computer, and sends an I/O request to one of said first storage system and said second storage system based on a disk identification (ID) included in said I/O request issued from said host computer.
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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 open system and an I/O subsystem B for a mainframe are connected by a communication unit. In order to back up the 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 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.
125 Citations
3 Claims
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1. A computer system comprising:
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a first storage system comprising a first disk controller, and one or more first disks coupled to said first disk controller;
a second storage system comprising a second disk controller, and one or more second disks coupled to said second disk controller; and
a controller coupled to said first storage system, said second storage system, and a host computer, wherein said controller receives an I/O request issued from said host computer, and sends an I/O request to one of said first storage system and said second storage system based on a disk identification (ID) included in said I/O request issued from said host computer. - View Dependent Claims (2, 3)
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Specification