Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2004-11-09
2008-08-12
Portka, Gary J (Department: 2185)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S114000, C711S202000
Reexamination Certificate
active
07412573
ABSTRACT:
The present invention makes it possible to change over a volume transparently with respect to a host. A first storage device2A and a second storage device2B are connected through a communication network3B; a volume8provided by the second storage device2B is mapped as a volume of the first storage device2A. A host1is capable of accessing either of the volume6or volume8via a virtual LU4. A connection control unit5, which may be constructed of tables or the like, connects the virtual LU4to either one of volume6and volume8. Changeover of the connection target is performed transparently with respect to the host1and so is not recognized by the host1. Consequently, the actual data storage target volume can be changed over while the host1always accesses the same virtual LU4.
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Taninaka Dai
Urabe Kiichiro
Uratani Ikuo
Antonelli, Terry Stout & Kraus, LLP.
Choe Yong J.
Hitachi , Ltd.
Portka Gary J
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