System executing log data transfer synchronously and database data transfer asynchronously
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United States of America Patent
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Feb 15, 2011
Grant Date -
Sep 22, 2005
app pub date -
Apr 7, 2004
filing date -
Mar 19, 2004
priority date (Note) -
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status (Latency Note)
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Abstract
A disaster recovery system and a method therefor, having: a function for receiving write requests from a host computer to write log information indicating the contents of a database process executed for a database buffer on a main site, database data updated on the database buffer and status information indicating the position of log information used for disaster recovery; a function for transferring the received write request for log information to a recovery site by a synchronous remote copy process; and a function for transferring the received write request for database data to the recovery site by an asynchronous remote copy process. While remote copy can be executed at a long distance without data loss, the deterioration of the performance of a database process on a main site can be suppressed.
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