Chapter 1. Understanding the IBM Power Systems 775 Cluster 81
applications. When a disk fails, erased data is rebuilt by using all of the operational disks in
the declustered array, the bandwidth of which is greater than the fewer disks of a conventional
RAID group. If another disk fault occurs during a rebuild, the number of impacted tracks that
require repair is markedly less than the previous failure and less than the constant rebuild
overhead of a conventional array.
The decrease in declustered rebuild impact and client overhead might be a factor of three to
four times less than a conventional RAID. Because GPFS stripes client data across ...
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