Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2004-12-02
2008-11-11
Sough, Hyung S (Department: 2188)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S100000, C711S117000, C711S161000
Reexamination Certificate
active
07451284
ABSTRACT:
The invention provides a storage system which can estimate a necessary capacity at the time of acquiring a snap shot copy without actually sampling the snap shot copy, and a control method of the same. In a storage system, a disk control unit monitors a write instruction from a host machine for a fixed period, and calculates a capacity necessary at the time of a snap shot, on the basis of the monitored information for the fixed period, in the case of receiving an instruction of calculating the capacity necessary at the time of acquiring the snap shot which makes it possible to refer to the data at a certain time point within a disk unit.
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Araki Masanori
Yamagami Kenji
Cygiel Gary W
Hitachi , Ltd.
Sough Hyung S
Townsend and Townsend / and Crew LLP
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