It turns out this isn't actually working. The problem is the PATH in cron, which does not include /sbin, where the zpool command lives. I've attached a debdiff to fix this. I've tested to confirm that the PATH thing fixes it, but on Sunday, I'll know absolutely 100% by verifying that it works "in the wild".
** Patch added: "fix-scrubbing.debdiff" https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1548009/+attachment/4696723/+files/fix-scrubbing.debdiff -- You received this bug notification because you are a member of Ubuntu Bugs, which is subscribed to Ubuntu. https://bugs.launchpad.net/bugs/1548009 Title: [FFe] ZFS pools should be automatically scrubbed To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/zfs-linux/+bug/1548009/+subscriptions -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs