Appeal No. 1997-2242 Page 3
Application No. 08/084,370
said data chunks distributed over said n active
disks and said n active disks arranged into a fully
folded array, the failed disk having chunks, each of
said chunks located on a different one of said
strips, a method of restoring said fully folded
array to a fully redundant condition comprising the
steps of:
substituting a replacement disk for said failed
disk;
determining, for each one of said strips, if
said chunk of said failed disk originally contained
only parity information or originally contained
data;
if said failed disk chunk originally contained
only parity information, then calculate said parity
information from said data chunks originally
associated with said parity information and write
said parity information on a corresponding chunk of
said replacement disk;
if said failed disk chunk originally contained data,
then
determine which one of said n active disks
originally contained a chunk of parity information;
read said data from said one of said n active disks;
write said data on said corresponding
replacement disk chunk;
calculate new parity information for said strip; and
write said recalculated parity information to
said one of said n active disks.
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