System for configuring a duplex shared storage

A shared storage duplicating method for a computer system including a process module having at least a main memory, a central processing unit, and a connection unit for connection to a system bus;

• and a plurality of shared storage modules each having at least a shared storage unit and a connection unit for connection to said system bus, each shared storage unit being allocated shared storage space accessible dependent on a physical address of said process module, said method comprising the steps of:
• dividing said shared storage space into partially-shared storage spaces;
• defining one of a single configuration and a duplex configuration of memory modules for each of said partially-shared storage spaces, said duplex configuration of memory modules formed by a pair of the memory modules in said plurality of shared storage modules, each of said plurality of shared storage modules being directly accessible by said process module;
• and
• specifying one of said plurality of shared storage modules by a unit ID having an inverted value at a specific bit in contrast with a unit ID of another of said plurality of shared storage modules.

A shared storage duplicating method for a computer system including process modules each having at least a main memory, a central processing unit, and a connection unit for connection to a system bus;

• and a plurality of shared storage modules each having at least a shared storage unit and a connection unit for connection to said system bus, said method comprising the steps of:
• dividing shared storage space accessible dependent on a physical address into partially-shared storage spaces, said shared storage space corresponding to a first shared storage module and a second shared storage module;
• defining one of a single configuration and a duplex configuration of memory modules for each of said partially-shared storage spaces, said duplex configuration of memory modules formed by a pair of the memory modules using said first shared storage module and said second shared storage module, each of said first shared storage module and said second storage module being directly accessible by each of said process modules;
• and
• specifying said second shared storage module by a unit ID having an inverted value at a specific bit in contrast with a unit ID of said first shared storage module.