Resynchronization of a target volume with a source volume
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United States of America Patent
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Dec 23, 2003
Grant Date -
N/A
app pub date -
Apr 3, 2001
filing date -
Apr 3, 2001
priority date (Note) -
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Abstract
An improved method and apparatus for quickly and efficiently updating the original source volume and original target volumes after the original source volume has become temporarily unavailable. The original target volume is characterized as a source volume while the original source volume is temporarily unavailable. Transfer lists of different data blocks are generated. Data blocks not originally found on a source are copied to the target. Data blocks included on a target that were not found on the source are removed. By focusing upon specific data blocks, this technique avoids the use of filer overhead and other computational resources that would be expended if the entire volume were recopied.
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