Triple parity technique for enabling efficient recovery from triple failures in a storage array
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United States of America Patent
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Aug 30, 2011
Grant Date -
Feb 25, 2010
app pub date -
Nov 6, 2009
filing date -
Dec 28, 2001
priority date (Note) -
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Abstract
A method for recovering from three failed data storage devices is disclosed. A plurality of data storage devices hold data, and a row parity storage device holds row parity for them. The data storage devices and the row parity storage device form a set of storage devices. A diagonal parity storage device and an anti-diagonal parity storage device hold parity computed diagonally over the set of storage devices. In the event of a failure of three data storage devices of the set of storage devices, a first failed storage device is chosen for first restoration. A missing block of the first failed storage device is computed by using the remaining set of storage devices, and the diagonal parity storage device, and the anti-diagonal parity storage device. The remaining two failed storage devices are restored by a diagonal parity restoration technique.
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