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Performance in WinBench 99

Finally, here are data-transfer graphs recorded in WinBench 99.

And these are the data-transfer graphs of the RAID arrays built on the HighPoint RocketRAID 4320 controller:

The following diagram compares the read speeds of the arrays at the beginning and end of the partitions created on them:

Everything seems to be all right here at first sight except that the degraded RAID5 is for some reason slower than the RAID6 without one disk, and only in the faster section of the partition. If you take a look at the graph, you can see a flat stretch in its left part, which indicates some bottleneck. The interface offers enough bandwidth, so we have only two explanations: the firmware algorithms are not perfect in terms of restoring data from checksums and they overload the processor or there is a bottleneck due to the very fact of data recovery through multiple read operations. We think the first explanation is more probable. By the way, you can see a similar horizontal stretch in the graph of the RAID6 with two failed disks.

 
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