Method for reconstructing data in case of two disk drives of RAID failure and system therefor
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United States of America Patent
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Dec 29, 2009
Grant Date -
May 29, 2008
app pub date -
Sep 22, 2006
filing date -
Jul 28, 2006
priority date (Note) -
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Abstract
The present invention is to provide a method for reconstructing data in case of failure of two HDs of a RAID, wherein the RAID is a logical disk drive assembly including at least three HDs and a RAID controller and data is divided into block strips which are stored on data blocks of different HDs respectively, The method comprises the steps of reading super blocks of all of the HDs; comparing the number of the HDs and time being involved in a previous operation and stored in the super blocks with each other; reading common data involved in the previous degraded operation of the RAID; writing the read common data into the super blocks of all of the HDs; and recovering a configuration of the RAID to the degraded mode again.
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