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67d34a1
(Get the code!)
mdadm automatically checks MD arrays. ZFS should automatically scrub pools.
I've attached a debdiff which accomplishes this.
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.
The cron.d in this patch scrubs on the second Sunday of the month. mdadm scrubs on the first Sunday of the month. This way, if a system has both MD and ZFS pools, the load doesn't all happen at the same time. If the system doesn't have both types, it shouldn't really matter which week.