[Bug 1548009] Re: ZFS pools should be automatically scrubbed
Colin Ian King
1548009 at bugs.launchpad.net
Mon Feb 22 16:00:01 UTC 2016
What about the issue of scrubbing on systems that don't have memory
correction (non-ECC). Is there a possibility that a scrub with silently
corrupted memory could actually introduce more harm than good?
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https://bugs.launchpad.net/bugs/1548009
Title:
ZFS pools should be automatically scrubbed
Status in zfs-linux package in Ubuntu:
New
Bug description:
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.
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