Exclusion of data from a persistent point-in-time image
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United States of America Patent
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Jan 29, 2013
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app pub date -
Apr 22, 2009
filing date -
Apr 22, 2009
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Abstract
A data set on a physical storage device is associated with an active bitmap and a persistent point-in-time image (PPI) exclusion bitmap, where each bit in the bitmaps is associated with a data block in the data set. The active bitmap and the PPI exclusion bitmap are used to determine which of the data blocks in the data set are to be included in a PPI of the data set.
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