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Date:      Tue, 5 Feb 2008 13:06:28 -0600
From:      Brooks Davis <brooks@freebsd.org>
To:        Joe Peterson <joe@skyrush.com>
Cc:        freebsd-fs@freebsd.org, Dag-Erling Sm??rgrav <des@des.no>, Brooks Davis <brooks@freebsd.org>
Subject:   Re: Forcing full file read in ZFS even when checksum error encountered
Message-ID:  <20080205190628.GA86728@lor.one-eyed-alien.net>
In-Reply-To: <47A8B24D.9050904@skyrush.com>
References:  <47A73C8D.3000107@skyrush.com> <86prvby5o1.fsf@ds4.des.no> <47A864D9.4060504@skyrush.com> <864pcnxz8f.fsf@ds4.des.no> <47A88ADE.7050503@skyrush.com> <86abmfwc6h.fsf@ds4.des.no> <20080205173102.GA85735@lor.one-eyed-alien.net> <47A8B24D.9050904@skyrush.com>

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On Tue, Feb 05, 2008 at 12:00:29PM -0700, Joe Peterson wrote:
> Brooks Davis wrote:
> > We've also experienced several situations were zfs was detecting
> > corruption caused by bad cabling or bad controller firmware so SMART had
> > nothing to report.
>=20
> Were the errors sporadic/intermittent?  I'd think that if it was cabling,=
 the
> checksum error could happen some times and not others.  Mine seems to be
> predictable and always there...  Also, no error was reported when the fil=
e was
> written, and I think ZFS checks after writing.  Strange.  This is one rea=
son
> why I'm very curious which bits are bad.

I'm not sure if they were consistent.  We didn't really care since either t=
he
data one the disk was platter wasn't the data we put there or we couldn't r=
ead
reliably.  We've not seen any checksum errors (in our somewhat limited
experience) that weren't a symptom of a real, underlying problem.

-- Brooks

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