SoftRAID RAID-4 / RAID-5 Performance with Heavy CPU load
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RAID-4 and RAID-5 offer fault tolerance against a drive failure. This fault tolerance derives from the use of parity data, which must be computed when disk writes are done.
This parity calculation is performed by the CPU and so if the CPU is heavily loaded, things slow down for writes (parity is not computed for reads by SoftRAID).
Read more and see the results:
SoftRAID RAID-4 / RAID-5 Performance with Heavy CPU load
See also: Software RAID Performance with SoftRAID 5.