> One thing I am at a loss to understand is why turning off the disk
quoted text
> caches when testing the JBOD performance produced almost identical (very
> slightly better) results.  Perhaps it was a case of the ZFS internal
> cache making the disks cache redundant?  Comparing to the ARECA
> passthrough (where the areca cache is used) shows again, similar results.
>
> -D
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My guess is it probably has to do with the way ZFS does cache flushes:
http://www.solarisinternals.com/wiki/index.php/ZFS_Evil_Tuning_Guide#Cache_Flushes
It might be worth it to disable the forced flushing and test again, if you
feel like it.

-Koen
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