On 04/30/10 10:35 AM, Bob Friesenhahn wrote:
On Thu, 29 Apr 2010, Roy Sigurd Karlsbakk wrote:
While there may be some possible optimizations, i'm sure everyone
would love the random performance of mirror vdevs, combined with the
redundancy of raidz3 and the space of a raidz1. However, as in all
systems, there are tradeoffs.
In my opinion periodic scrubs are most useful for pools based on
mirrors, or raidz1, and much less useful for pools based on raidz2 or
raidz3. It is useful to run a scrub at least once on a well-populated
new pool in order to validate the hardware and OS, but otherwise, the
scrub is most useful for discovering bit-rot in singly-redundant pools.
I agree.
I look after an x4500 with a poll of raidz2 vdevs that I can't run
scrubs on due the the dire impact on performance. That's one reason I'd
never use raidz1 in a real system.
--
Ian.
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