Electrical computers and digital processing systems: memory – Address formation – Address mapping
Reexamination Certificate
2004-02-03
2008-10-21
Kim, Matt (Department: 2186)
Electrical computers and digital processing systems: memory
Address formation
Address mapping
C711S207000, C711S114000, C711S118000, C710S038000
Reexamination Certificate
active
07441095
ABSTRACT:
A first storage controller has a multilayer memory hierarchy constructed by LDEV (logical device) connected from LUN, and VDEV (virtual device) connected to the lower order of the LDEV. At least one of the VDEVs is constructed by mapping the memory resources arranged in external storage controllers. The functions of a stripe, RAID, etc. can be added in the mapping. Various kinds of functions (remote copy, variable volume function, etc.) applicable to the normal internal volume can be also used in a virtual internal volume by using the external memory resource as the virtual internal memory resource so that the degree of freedom of utilization is raised.
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patent: 03
Nakayama Shin-ichi
Tamura Keishi
Uchiumi Katsuhiro
Hitachi , Ltd.
Kim Matt
Mattingly ,Stanger ,Malur & Brundidge, P.C.
Patel Hetul
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