> This line of reasoning doesn't get you very far.
>  It is much better to take a look at<br>
> the mean time to data loss (MTTDL) for the various
> configurations.  I wrote a<br>
> series of blogs to show how this is done.<br>
> <a href="http://blogs.sun.com/relling/tags/mttdl"; 
> target="_blank">http://blogs.sun.com/relling/tags/mttdl</a><br><br>

I will play the Devils advocate here and point out that the chart shows MTTDL 
for RAIDZ2, both 6 and 8 disk, is much better than mirroring.

The chart does show that three way mirroring is better still and I would guess 
that RAIDZ3 surpasses that.
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