Each controller is a little different.
I normally use 64k to 128k stripe size.
I read that the smaller the stripe (like 4k or 8k), the more cpu ativity is needed to stripe data and write, larger stripes get larger pieces of the file written to disk. But if stripe is too large, then the benifit of RAID is lost, because basically you have two hard drives working indepently.
Larger stripes should not cause more cpu load compared to smaller stripe sizes.
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