Electrical computers and digital processing systems: memory – Storage accessing and control – Control technique
Reexamination Certificate
2011-05-17
2011-05-17
Peugh, Brian R (Department: 2187)
Electrical computers and digital processing systems: memory
Storage accessing and control
Control technique
C711S151000, C711S167000
Reexamination Certificate
active
07945750
ABSTRACT:
A storage system of this invention maintains consistency of the stored contents between volumes even when a plurality of remote copying operations are executed asynchronously. A plurality of primary storage control devices and a plurality of secondary storage control devices are connected by a plurality of paths, and remote copying is performed asynchronously between respective first volumes and second volumes. Write data transferred from the primary storage control device to the secondary storage control device is held in a write data storage portion. Update order information, including write times and sequential numbers, is managed by update order information management portions. An update control portion collects update order information from each update order information management portion, determines the time at which update of each second volume is possible, and notifies each-update portion. By this means, the stored contents of each second volume can be updated up to the time at which update is possible.
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Arakawa Hiroshi
Deguchi Akira
Ninose Kenta
Okumoto Katsuhiro
Antonelli, Terry Stout & Kraus, LLP.
Hitachi , Ltd.
Peugh Brian R
Thammavong Prasith
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