Electrical computers and digital processing systems: memory – Storage accessing and control – Hierarchical memories
Patent
1995-03-22
1999-01-12
Chan, Eddie P.
Electrical computers and digital processing systems: memory
Storage accessing and control
Hierarchical memories
711 4, 711 5, 711202, 711206, 39518205, 39518301, 39518317, G06F 1100, G06F 1120
Patent
active
058599606
ABSTRACT:
Each semiconductor memory module is divided into a plurality of access control units, and a service adapter copies the contents of the memory of the semiconductor memory module in which a memory error has occurred, to a spare semiconductor memory module one access control unit at a time. It is thus possible to evacuate the contents of the memory of the semiconductor memory module in which the memory error has occurred without stopping the semiconductor disk apparatus simply by adding the spare semiconductor disk apparatus. Since the copying operation is executed one access control unit at a time, a resource manager can conduct exclusive control also one access control unit at a time. A host apparatus therefore can access an access control unit portion which is not the object of copying even in the process of copying. In other words, the copying operation exerts no deleterious influence on the access of the host apparatus.
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Kurihara Takuya
Murayama Takashi
Nishi Hidetoshi
Sugesawa Yasuyoshi
Chan Eddie P.
Fujitsu Limited
Nguyen Than V.
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