On October 24, 2006 3:15:10 PM -0400 Dale Ghent <[EMAIL PROTECTED]> wrote:
On Oct 24, 2006, at 2:46 PM, Richard Elling - PAE wrote:
Pedantic question, what would this gain us other than better data
retention?
Space and (especially?) performance would be worse with RAID-Z+1
than 2-way mirrors.
You answered your own question, it would gain the user better data
retention :)
The space tradeoff is an obvious side effect and unavoidable. For
situations where this is not an overriding issue, it just isn't an
issue. I don't believe performance would be adversely impacted to a
practical degree, though.
Really?
<http://blogs.sun.com/roch/entry/when_to_and_not_to> says a raid-z
vdev has the read throughput of 1 drive for random reads. Compared
to #drives for a stripe. That's pretty significant.
-frank
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