Method and apparatus for data duplexing in storage unit system
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United States of America Patent
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Jan 17, 2006
Issued Date -
N/A
app pub date -
May 12, 2003
filing date -
Sep 12, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
With the purpose of achieving consistent non-synchronous copying of data from a plurality of primary side control units to a plurality of secondary side control units, all of the secondary side control units are connected via a loop, and each of the secondary side control units determines guarantee time by circulating a time added to the data received from the primary side control units via said loop communication route. A consistent data copying is guaranteed by circulating the determined guarantee time via the loop communication route.
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