Information storage system
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United States of America Patent
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Jun 24, 2003
Grant Date -
Apr 24, 2003
app pub date -
Oct 28, 1999
filing date -
Oct 29, 1998
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
By assuring and maintaining consistency of data within a range expected by the user, significance of the consistency of data is assured. A master control unit 105 to which write data and its write time is transferred from an information processor 100 is provided with a function of obtaining the latest write time and the oldest write time of write data which has not been copied to each of remote control units 115 as a copy destination at proper timings and comparing the difference between the latest and oldest write time with a preset time on the basis of a data consistency unit such as a data set. When the difference reaches or exceeds the present time, data within the data consistency assuring range is suspended or write data and copy data is regulated.
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