Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2007-07-10
2010-02-23
Verbrugge, Kevin (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C713S324000
Reexamination Certificate
active
07669023
ABSTRACT:
Power consumption in a storage system is reduced by selectively controlling power supplied to the storage devices, while also incorporating a de-duplication function to reduce the amount of required storage capacity. First storage devices are initially in a powered on condition and second storage devices are in a powered off condition. Write data received by the controller is initially stored to a first volume allocated from the first storage devices. While the second storage devices are powered on, content of the write data stored in the first volume is compared with content of any existing data stored in a second volume allocated on the second storage devices. When results of the comparison show that the content of the write data does not match the content of the existing data, the write data is stored to the second volume.
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Hitachi , Ltd.
Mattingly & Malur, P.C.
Verbrugge Kevin
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