This bug was fixed in the package zfs-linux - 0.6.5.7-0ubuntu4
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zfs-linux (0.6.5.7-0ubuntu4) yakkety; urgency=medium
* Set PATH in cron.d job to fix monthly scrubs. (LP: #1548009)
-- Richard Laager <rlaa...@wiktel.com> Wed, 06 Jul 2016 22:37:47 -0500
** Changed in: zfs-linux (Ubuntu)
Status: In Progress => Fix Released
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https://bugs.launchpad.net/bugs/1548009
Title:
ZFS pools should be automatically scrubbed
Status in zfs-linux package in Ubuntu:
Fix Released
Bug description:
mdadm automatically checks MD arrays. ZFS should automatically scrub
pools too. Scrubbing a pool allows ZFS to detect on-disk corruption
and (when the pool has redundancy) correct it. Note that ZFS does not
blindly assume the other copy is correct; it will only overwrite bad
data with data that is known to be good (i.e. it passes the checksum).
I've attached a debdiff which accomplishes this. It builds and
installs cleanly.
The meat of it is the scrub script I've been using on production
systems, both servers and laptops, and recommending in my Ubuntu root-
on-ZFS 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 theoretically lead to another failure. We
should save that disk load for resilvering. 2) Performance is already
less on a degraded pool and scrubbing can make that worse, even though
scrubs are throttled. Arguably, I might be being too conservative
here, but the marginal benefit of scrubbing a *degraded* pool is
pretty minimal as pools should not be left degraded for very long.
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. If you'd rather make it the same week as MD, I see
no problem with that.
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