Public bug reported:
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.
** Affects: zfs-linux (Ubuntu)
Importance: Undecided
Status: New
** Patch added: "zfs-linux.scrub.debdiff.2"
https://bugs.launchpad.net/bugs/1548009/+attachment/4577024/+files/zfs-linux.scrub.debdiff.2
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https://bugs.launchpad.net/bugs/1548009
Title:
ZFS pools should be automatically scrubbed
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