System for configuring a duplex shared storage

Details System for configuring a duplex shared storage System for configuring a duplex shared storage

1995-04-21

1999-10-05

Bragdon, Reginald G.

Electrical computers and digital processing systems: memory

Storage accessing and control

Shared memory area

711153, 711162, 39518204, 395846, G06F 1216, G06F 1116

Patent

active

059639768

ABSTRACT:
A shared storage configuration system for use in a computer system includes a plurality of processing modules. Each of the processing modules includes at least a main storage unit, a central processing unit and a connecting unit for connection to a system bus. The shared storage system also includes a plurality of shared storage modules. Each of the shared storage modules includes a shared storage unit and a connection unit for connection to the system bus. A space inherent in the processing modules is accessible by physical addresses of said central processing unit of each of the processing modules. A shared storage space is accessible by the physical addresses of said central processing unit of each of the processing modules. Further, the shared storage space is divided into a partially-shared storage space, a duplex configuration of the shared storage module is defined for each part of the partially-shared storage space, and another shared storage module is specified having an inverted value in a specific bit of its unit ID, in contrast with a unit ID of the shared storage module corresponding thereto.

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