Method and apparatus for reconstructing redundant array of inexpensive disks, and system
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United States of America Patent
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Sep 23, 2014
Grant Date -
May 23, 2013
app pub date -
Dec 14, 2012
filing date -
Oct 19, 2010
priority date (Note) -
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Abstract
Embodiments of the present invention provide a method and apparatus for reconstructing a RAID, and a system, when a first physical disk is faulty, finding DUs of other physical disks, where the DUs are located on a same LDS as a DU of the first physical disk, in each logic module of a pre-generated layout template, performing exclusive-OR on data read from the DUs of other physical disks, and writing the data into a hot spare DU of a second physical disk; and in the layout template, replacing a DU identifier of the first physical disk with a DU identifier of the second physical disk, where DUs corresponding to DU identifiers in each LDS in the layout template belong to different physical disks. The present invention can reduce time needed for writing the data, shorten time needed for RAID reconstruction and restoration, and improve a reconstruction speed.
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