Small chunk size read performance penalty

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Can anyone point me to a good explanation of the read performance impact
of small (RAID-5 and RAID-6) chunk sizes?

I understand why large chunks hurt write performance, but I haven't been
able to reason through the small-chunk/read case, and my Interweb
searches haven't really turned anything up.

The "read penalty" is definitely there; I can see it in the test data
from my NAS.  I just don't understand *why* it's there.

Thanks!

-- 
========================================================================
Ian Pilcher                                         arequipeno@xxxxxxxxx
Sometimes there's nothing left to do but crash and burn...or die trying.
========================================================================

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