Thanks Richard,

Just a few things:

"The meat of it is the scrub script I've been using (and recommending in
my HOWTO) for years, which scrubs all *healthy* pools. If a pool is not
healthy, scrubbing it is bad for two reasons:

1) It adds a lot of disk load which could lead to another failure. We should 
save that disk load for resilvering. 
2) Performance is already less on a degraded pool and scrubbing will make that 
worse."

Yep, this sounds perfectly reasonable to me.

1) So, how much extra wear will scrubbing involve?  I'm concerned that extra 
write cycles may add extra wear to users using SSDs.
2) How much extra load and performance loss do we get with scrubbing? It would 
be good to get some idea so we have an informed idea of the kind of impact this 
adds.

Secondly, this is actually a feature, so if we go with this I need to
fix this issue with a feature freeze exception, which requires some
extra work.

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https://bugs.launchpad.net/bugs/1548009

Title:
  ZFS pools should be automatically scrubbed

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