Mark Lord wrote:

My basic hdparm timing test shouldn't show much of a difference
with NCQ tests, becase hdparm just does a single request at a time,
and waits for the results before issuing another.  Now, kernel read-ahead
may result in some command overlap and a slight throughput increase, 
but..

Something like dbench and/or bonnie++ are more appropriate here.

Cheers
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How effective can NCQ be in a RAID5/RAID6 environment? If at all?

I wouldn't think it would be.. but maybe i'm not seeing the forest for 
the trees..

Regards,
Tyler.