To date, RAID technology, with its single parity, offered protection from a single failed disk with the caveat that no other disk fail or, increasingly more likely as disk media grow larger, an uncorrectable bit error not occur during a read operation while reconstruction of data lost on the failed disk was still in progress. If either secondary event occurs during reconstruction, then some or all data contained in the RAID array or volume could be lost. This paper provides an overview of RAID-DP and how it dramatically increases data fault tolerance from various disk failure scenarios.
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