Remote copy for a storage controller with reduced data size
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United States of America Patent
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Jan 23, 2007
Issued Date -
N/A
app pub date -
Dec 30, 2005
filing date -
Aug 19, 1999
priority date (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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