> From: Edward Ned Harvey (opensolarisisdeadlongliveopensolaris)
> Performance is much better if you use mirrors instead of raid.  (Sequential
> performance is just as good either way, but sequential IO is unusual for most
> use cases. Random IO is much better with mirrors, and that includes scrubs &
> resilvers.)

Even if you think you use sequential IO...  If you use snapshots...  Thanks to 
the nature of snapshot creation & deletion & the nature of COW, you probably 
don't have much sequential IO in your system, after a couple months of actual 
usage.  Some people use raidzN, but I always use mirrors.

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