Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2007-05-01
2007-05-01
Bragdon, Reginald (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S112000, C709S217000, C710S015000
Reexamination Certificate
active
10917800
ABSTRACT:
Two data centers located in the vicinity are connected using a synchronous transfer copy function, and one of the data centers is coupled with a third data center disposed at a remote location by an asynchronous remote copying function. The order whereat a storage sub-system located in the vicinity has received data from a host is consistently guaranteed, and the third data center holds the data. Further, each storage sub-system includes a function whereby, during normal operation, data can be exchanged and the data update state can be obtained by the storage sub-systems located in the two data centers that do not directly engage in data transmission.
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Abei Hiroshi
Higaki Seiichi
Kishiro Shigeru
Koide Takeshi
Nagasawa Teruo
Bragdon Reginald
Namazi Mehdi
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