System and method for supporting asynchronous data replication with very short update intervals
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United States of America Patent
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Apr 17, 2012
Grant Date -
May 27, 2010
app pub date -
Jan 27, 2010
filing date -
Dec 19, 2003
priority date (Note) -
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Abstract
A system and method for improving the efficiency of the transmission of updated blocks generated by logging all the block allocations and deletes as well as CPs and PCPI creation and deletion in a persistent log. The log is scanned during each update cycle (in which changes are transmitted to a destination mirror) by the storage operating system, and only changed blocks that are referenced by the file system as it existed at the end of the update cycle or referenced by PCPIs that existed at the end of the update cycle are actually sent in the transmission. This reduces the number of changes being transmitted.
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