Method for duplicating data of storage subsystem and data duplicating system
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United States of America Patent
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Dec 27, 2005
Grant Date -
Apr 22, 2004
app pub date -
Oct 14, 2003
filing date -
Mar 31, 2000
priority date (Note) -
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status (Latency Note)
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Abstract
In order to realize asynchronous type system assuring the consistency of data with the function of disk subsystems without the need of introducing new software to a host unit and without the deterioration of the performance of a main center, in a remote copy system which copies the data to the disk subsystems of the remote center for duplicating the data in the disk subsystems of the main center, the disk subsystems give serial numbers and times to the data together with writing said data to the storage devices in the disk subsystem and transfer said data to the other disk subsystems, and the other disk subsystems arrange the two or more data in the sequence of the serial numbers, decide the oldest time among the latest time given to each of the disk subsystems communicating among the disk subsystems and the data given with the time not later than the decided oldest time are the objects of writing to each of the disk storage devices.
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