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From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= <des@des.no>
To: Pieter de Goeje <pieter@degoeje.nl>
References: <20100308102918.GA5485@localhost> <4BA20088.3050006@quip.cz>
	<86vdctkhpw.fsf@ds4.des.no> <201003181234.10667.pieter@degoeje.nl>
Date: Thu, 18 Mar 2010 13:18:04 +0100
In-Reply-To: <201003181234.10667.pieter@degoeje.nl> (Pieter de Goeje's message
	of "Thu, 18 Mar 2010 12:34:10 +0100")
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Cc: freebsd-current@freebsd.org, Miroslav Lachman <000.fbsd@quip.cz>
Subject: Re: A tool for remapping bad sectors in CURRENT?
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Pieter de Goeje <pieter@degoeje.nl> writes:
> Dag-Erling Sm=C3=B8rgrav <des@des.no> writes:
> > And if you're comfortable *writing* kernel code, I would suggest
> > implementing WORF in geom_mirror :)
> I am intrigued, what is this WORF you speak of?

Write On Read Failure.  It means that if you can't read a sector but you
have (or can recreate) a copy of the data that's supposed to be on it,
you rewrite that data to force the disk to reallocate the sector.  I've
done this manually several times (dd'ed a sector from the other disk in
a mirror).  I believe I even posted the procedure at some point; I'll
check my archive.

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