System and method of an efficient snapshot for shared large storage
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United States of America Patent
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Aug 1, 2006
Grant Date -
Apr 29, 2004
app pub date -
Jul 3, 2003
filing date -
Oct 24, 2002
priority date (Note) -
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Abstract
An efficient snapshot technique based on a mapping for a large logical volume shared in multiple hosts. According to the present invention, problems of time delays in a conventional snapshot technique is solved by employing a FAB and an SSB, which are bits representing whether a COW operation is carried out to a mapping entry. In other words, the present invention solves the problems of delaying a write operation of corresponding volume, which is simultaneously executed when a snapshot is created, until the snapshot creation is completed.
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