And no ... zfs scrub isn't a hidden fsck

I’ve got quite a number of tweets and mails with the question “But is zfs scrub” not something like fsck. And the answer is “Well … no”.

So, no zfs scrub is no fsck, it has a different job. It might look like a fsck, but it isn’t. Forget everything how you expect filesystems internals from your pre-ZFS knowledge. I can give just one important advice in regard of understanding ZFS. An advice that was already used on the first presentations about ZFS: Free your mind!