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Date:      Tue, 05 Feb 2008 18:22:30 +0100
From:      =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To:        Joe Peterson <joe@skyrush.com>
Cc:        freebsd-fs@freebsd.org
Subject:   Re: Forcing full file read in ZFS even when checksum error encountered
Message-ID:  <86abmfwc6h.fsf@ds4.des.no>
In-Reply-To: <47A88ADE.7050503@skyrush.com> (Joe Peterson's message of "Tue\,  05 Feb 2008 09\:12\:14 -0700")
References:  <47A73C8D.3000107@skyrush.com> <86prvby5o1.fsf@ds4.des.no> <47A864D9.4060504@skyrush.com> <864pcnxz8f.fsf@ds4.des.no> <47A88ADE.7050503@skyrush.com>

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Joe Peterson <joe@skyrush.com> writes:
> Dag-Erling Sm=C3=B8rgrav <des@des.no> writes:
> > There is now way to "read the bad data" since an unrecoverable
> > checksum error means that ZFS has no idea which of the multiple
> > version of the affected block is the right one.
> Nope, no mirror, no RAIDZ - just one partition.  But as far as I know, th=
ere
> were no read errors, just a checksum error.

A checksum error results from a read error.  Check your drive's SMART
error log if it has one.  It might not be detectable in a surface scan,
as the damaged sector will be automatically reassigned if it's written
to (which ZFS may very well have done)

DES
--=20
Dag-Erling Sm=C3=B8rgrav - des@des.no



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