Hitachi, Ltd.

Kikuko Morishima

Hiroshi Morishima

Susumu Okuhara

Shingo Maeda

Processor apparatuses share data, used in common for a plurality of systems, in a global memory in a share system. The global memory is divided into constant units and the individual division units are managed by using identifiers which are definitely determined as viewed from the processor apparatuses and the share system. When an inter-system exclusive state conditioning unit of a processor apparatus designates a desired area on an address space in the processor apparatus by using an identifier to obtain a locked resource, an update state confirming unit checks whether data in a corresponding unit in the share system is updated, and when the data is updated, a data transferring unit transfers the data in the corresponding unit in the share system to the address space. Accordingly, a program operating on each computer system can easily access the data shared by the systems without being aware of the presence of the share system. When the locked resource is released, a data transferring unit transfers the data to the corresponding unit in the share system if the data in the address space is updated.

Data sharing method in a plurality of computer systems

A composite computer system which includes a plurality of processors connected to each other by a communication apparatus, an operation supervisory unit for recording operating conditions of the processors when the processors are activated or deactivated, an operation supervisory network for connecting the processors and the operation supervisory unit and a program condition management apparatus for recording operating conditions of programs when the programs of the processors are activated or deactivated. The operation supervisory unit obtains, for fault location purposes, the operating conditions of the processors recorded in the operation supervisory unit via the operation supervisory network and the operating conditions of the programs recorded in the program condition management apparatus.

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Yokohama, Japan

Kikuko Morishima