On Sep 16, 2009, at 9:38 AM, Marty Scholes wrote:
Generally speaking, striping mirrors will be faster
than raidz or raidz2,
but it will require a higher number of disks and
therefore higher cost to
The main reason to use
raidz or raidz2 instead
of striping mirrors would be to keep the cost down,
or to get higher usable
space out of a fixed number of drives.
While it has been a while since I have done storage management for
critical systems, the advantage I see with RAIDZN is better fault
tolerance: any N drives may fail before the set goes critical.
With straight mirroring, failure of the wrong two drives will
invalidate the whole pool.
This line of reasoning doesn't get you very far. It is much better to
take a look at
the mean time to data loss (MTTDL) for the various configurations. I
wrote a
series of blogs to show how this is done.
http://blogs.sun.com/relling/tags/mttdl
-- richard
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