Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2007-04-03
2007-04-03
Bragdon, Reginald (Department: 2189)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S162000, C711S167000
Reexamination Certificate
active
10950577
ABSTRACT:
In the conventional storage system, consistency is ensured only for writing from a single storage. Asynchronous remote copying and local replication are also alternately suspended in the conventional system, so that the suspension time increases and the volume in which consistency is obtained becomes old. Two local replicas are prepared, for a volume containing stored data that is transferred from the main site by asynchronous remote copying, in the storage at the sub-site. Each pair of local replicas is alternately suspended by a time-specific suspension command according to the time of the timestamp attached to the write data, and replica data in which the time sequence is secured is continually prepared. When a failure occurs at the main site, the data is recovered using the replica data.
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C. Mikkelsen, “The Hitachi NanoCopy™ Advantage—An Industry First for Point-in-Time and Real-Time Copy”.
Arakawa Hiroshi
Iwamura Takashige
Maruyama Tetsuya
Ninose Kenta
Antonelli, Terry Stout and Kraus, LLP.
Bragdon Reginald
Hitachi , Ltd.
Vo Thanh D
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