Remote copy control method, storage sub-system with the method, and large area data storage system using them
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United States of America Patent
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Jul 25, 2006
Grant Date -
Mar 13, 2003
app pub date -
Mar 8, 2002
filing date -
Aug 8, 2001
priority date (Note) -
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status (Latency Note)
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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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