On Mon, 28 Sep 2009, Richard Elling wrote:
Many people here would profoundly disagree with the above. There is no
substitute for good backups, but a periodic scrub helps validate that a
later resilver would succeed. A perioic scrub also helps find system
problems early when they are less likely to crater your business. It is
much better to find an issue during a scrub rather than during resilver of
a mirror or raidz.
As I said, I am concerned that people would mistakenly expect that scrubbing
offers data protection. It doesn't. I think you proved my point? ;-)
It does not specifically offer data "protection" but if you have only
duplex redundancy, it substantially helps find and correct a failure
which would have caused data loss during a resilver. The value
substantially diminishes if you have triple redundancy.
I hope it does not offend that I scrub my mirrored pools once a week.
Bob
--
Bob Friesenhahn
bfrie...@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/
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