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Date:      Mon, 27 Oct 2014 19:45:14 -0700
From:      "Russell L. Carter" <rcarter@pinyon.org>
To:        freebsd-fs@freebsd.org
Subject:   Re: ZFS errors on the array but not the disk.
Message-ID:  <544F033A.8070808@pinyon.org>
In-Reply-To: <CACpH0McVeuUGoC45rsK-cwrG0TFd_s=Cj66G7_TX=8a8jNBWQQ@mail.gmail.com>
References:  <CACpH0MeAvs6rzWUo3uF8uTygPk6qnZE8W=3-zsiTAKdvm4N01w@mail.gmail.com> <CAOtMX2g5GYZqYgWNmD_K_TSdTc8oxvvpe4463ni=sEX_b7_Erw@mail.gmail.com> <CACpH0MfL1J8fbP%2BMkdop8C=iTJmvscDv16mVynSqXC0uspdLfw@mail.gmail.com> <544B12B8.8060302@freebsd.org> <CACpH0Md8f1dAqUvgAMnKN%2BiZbWmL2ANXuwj7xDqkiGcHaiS9jg@mail.gmail.com> <CACpH0MdQDi85pvks%2BE1A2OYRKYXi6CMiXcsL4U1Ud5r_Zw4d8g@mail.gmail.com> <CA%2B-fWwBgh-mzKFRVhtddZVZz9j8T2fh-M-gpgR%2B4XmchbW8W1A@mail.gmail.com> <CACpH0McVeuUGoC45rsK-cwrG0TFd_s=Cj66G7_TX=8a8jNBWQQ@mail.gmail.com>

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On 10/27/14 18:47, Zaphod Beeblebrox wrote:
> Well... why wouldn't this trigger an error with (say) the checksums
> on the devices themselves?  Without throwing an error, why is the
> vdev re - resilvering?  I don't have spare hardware to throw at it.
> It's otherwise a sane system.  It can "make -j32 buildworld"
> without choking.  It can download several hundred torrents at a
> time without corrupting them. Hardly seems like suspect hardware.

I will just say as a non-zfs expert that I have had several disastrous
raid failures over the last 15 yrs, and a couple that cost me real
money, and it was always hw.

And the reason it was disastrous was I couldn't diagnose it even though
I was a pseudo-expert.  I spent a lot of time under deadlines assuming
the underlying hw was sane.  The software diagnostics were no help.
I trusted the hw then, but no more.  And your reports (thank you) are
a reminder to me to not give too much credence to zpool status.

BR,
Russell


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