Re: Poor raid 1 performance?

Peter wrote:
Yes, but also _any_ read is done twice, on both channels and both 

mechanisms

(and furthermore they are then checked for equality between, which adds a
step, which could be a reason for misperformance).

I do not see why you could see improvements, any other things being equal 

of

course. 


http://www.9to5computer.com/atto/Comparing-Raid-Configurations.htm
http://www.storagereview.com/guide2000/ref/hdd/perf/raid/levels/singleLevel1.html

With a good controller, sequential read performance equals that of a single
drive, random read performance scales up with number of drives in a RAID.



Thanks. These were the sorts of descriptions that led me to hope that raid 1 would lead to improved read performance. Eg, one site says that "Read performance is faster than a single disk; (if the array controller is capable of performing simultaneous reads from both devices of a mirrored pair)."

This is why I was then suspecting that the motherboard implementations are poor. On the other hand, it might be just that the test was more reflective of sequential than random read performance.

Can anyone suggest a raid 1 array that has improved performance?
.

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