Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2007-05-07
2010-12-14
Peugh, Brian R (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S167000
Reexamination Certificate
active
07853770
ABSTRACT:
There is a need to improve access speed for a file in a storage system that is provided with multiple storage units having different access speeds.The storage system (10) includes an access frequency acquiring part (14) that divides a past constant accessed data acquisition period into multiple unit periods, and obtains an access frequency for file stored in any of the multiple storage units (30and31), a similarity degree calculating part (16) that obtains, for each file, a similarity degree between the access frequency to the file for each unit period, and the access frequency to every other file for each unit period, a grouping process part (17) that groups one or more other files having a similarity degree equal to or higher than a predetermined value, in an identical group, and a file relocation part (18) that places a file belonging to the identical group into a storage unit (30) having a high access speed, when the file stored in the storage units (30and31) is accessed and there exists any other file within the identical group to which the file belongs.
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Tajima Sachie
Ueda Ryoichi
Antonelli, Terry Stout & Kraus, LLP.
Chen Sam
Hitachi , Ltd.
Peugh Brian R
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