Method and system for calculating single and dual parity for networked storaged elements
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United States of America Patent
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Aug 12, 2008
Grant Date -
Feb 9, 2006
app pub date -
Aug 4, 2005
filing date -
Aug 4, 2004
priority date (Note) -
Expired
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Abstract
A method of calculating single and dual parity for a networked array of storage elements is presented. The method includes deriving a first set of n relationships where each of the first set of n relationships consists of an XOR statement equaling zero. Each of the first set of n relationships contains n data symbols from n storage elements and one parity symbol from a first set of parity symbols. The method also includes deriving a second set of n+1 relationships where each of the second set of n+1 relationships consists of an XOR statement equaling zero, containing at least n-1 data symbols from at least n-1 storage elements and one parity symbol from a second set of parity symbols. Using both the first and second sets of derived relationships, scripts are generated to resolve unresolved symbols resulting from possible single-and dual-storage element failure combinations.
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