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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).

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SoftRAID RAID-4 / RAID-5 Performance with Heavy CPU load

See also: Software RAID Performance with SoftRAID 5.

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