Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2006-09-15
2008-09-02
Bataille, Pierre-Michel (Department: 2186)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S114000, C711S170000
Reexamination Certificate
active
07421553
ABSTRACT:
Under a hetero-environment in which different sorts of disk-systems are mixed with each other, a data guaranteeing operation can be carried out. When a cache controller of a local disk system receives a data writing request from a host computer, the cache controller stores data into a local disk provided in a disk device group. The data received from the host computer is also transmitted to a remote disk system and is stored in a remote disk. The data stored in the remote disk is immediately read, and the data written in the remote disk is compared with the data written in the local disk. As a result, since a data guarantee operation on the remote side is processed by the local disk system instead of the remote disk system, a data guaranteeing operation when a remote copying operation is performed can be carried out even in the storage system under a hetero-environment.
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Gotoh Youichi
Nakayama Shin-ichi
Tamura Keishi
Bataille Pierre-Michel
Mattingly ,Stanger ,Malur & Brundidge, P.C.
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