Electrical computers and digital processing systems: memory – Storage accessing and control – Specific memory composition
Reexamination Certificate
2008-05-13
2008-05-13
Sparks, Donald (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Specific memory composition
C714S006130
Reexamination Certificate
active
07373456
ABSTRACT:
Times at which requests for a data read or data write from/to a logical volume are received are stored in memory as access times of a RAID group making up the logical volume. When a predetermined time has elapsed after the access time, a number of the hard disk drives according to the redundancy of the RAID group are set to a power saving mode. Assume there are first hard disk drives and second hard disk drives having shorter lifes and the RAID group exceeds a predetermined time after the access time. When the RAID group consists of only the first drives, a number of the first drives according to the redundancy of the RAID group are set to a power saving mode and when it consists of only the second drives, an arbitrary number of second drives are set to a power saving mode.
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Hakamata Kazuo
Kano Azuma
Yamazaki Takashi
A. Marquez, Esq. Juan Carlos
Bradley Matthew
Fisher Esq. Stanley P.
Hitachi , Ltd.
Reed Smith LLP
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