System and method to preserve and recover unwritten data present in data cache of a disk subsystem across power outages
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United States of America Patent
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Jan 1, 2013
Grant Date -
Jul 8, 2010
app pub date -
Jan 2, 2009
filing date -
Jan 2, 2009
priority date (Note) -
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Abstract
Disclosed are a system and method to preserve and recover unwritten data present in data cache of a disk subsystem across power outages. In one embodiment, a method of a controller is described. The method includes applying a write-back technique between a host server and a data store, accessing a dirty data in a cache memory during a power outage. The method may apply an algorithm for efficiently offloading the dirty data to a non-volatile storage device during the power outage. In addition the method may apply the algorithm to efficiently transfer the dirty data from the non-volatile storage device to the data store when power is restored.
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