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RAID stripe size (was: 5.1 RAID5 write performance)

> Ah, yes, the old 
> rmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmwrmw
>  cycle.  Gets me every time.
OK, I've fixed that (before doing the tests I reported the last two days).

So, what's the advantage of a larger sectPerSU?
It appears to me that the raidctl manpage should note that
-- the stripe size should match fsbsize
-- partitions within the RAID should be aligned to the stripe size.

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