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AssigneeHitachi, Ltd.
InventorsToshio Nakano, Katsunori Nakamura, Mikito Ogata, Yoshinori Okami, Seiichi Higaki, Hiroshi Abei, Shigeru Kishiro
Estimating the term…
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.
A remote copy control method for a storage sub-system comprising a control memory for storing control data, a cache memory for temporarily storing data, a microprocessor for controlling said control memory and said cache memory, a plurality of synchronous data destinations for synchronously receiving data from said microprocessor, and a plurality of asynchronous data destinations for asynchronously receiving data from said microprocessor, said remote copy control method comprising:
A storage sub-system, which includes a control memory for storing control data, a cache memory for temporarily storing data, a microprocessor for controlling said control memory and said cache memory, a first data destination for synchronously receiving said data from said microprocessor and a second data destination for asynchronously receiving said data from said microprocessor, comprising:
Dependencies are inferred from the claim text.