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Date:      Fri, 08 May 1998 20:16:48 -0700
From:      "L. Floyd" <lfloyd@sonic.net>
To:        Freebsd-questions@FreeBSD.ORG
Subject:   Re: Masking out bad blocks
Message-ID:  <3553CAA0.ADB30085@sonic.net>
References:  <Pine.BSF.3.96.980508135818.28068V-100000@gdi.uoregon.edu>

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Is there an equivalent method for mapping bad blocks on an EIDE drive? 
I have an EIDE disk that I'm about ready to get rid of due to a
multitude of i/o problems related to it.

- Larry

Doug White wrote:
> 
> On Thu, 7 May 1998, Clod Baldrick wrote:
> 
> > fsck tells us we have bad blocks on a file system, but apparently makes no
> > attempt to mask out these blocks.  Does anyone know how we can do this?
> > It used to be the case that doing a low-level format would give us a table
> > of bad blocks for mkfs to ignore, but scsiformat doesn't seem to do this
> > -- and it completes in around a second.
> 
> The disk should silently map these bad blocks itself.  Make sure that auto
> relocation is enabled by running
> 
> scsi -f /dev/rsdX -m 1
> 
> and verify that AWRE and ARRE are set to 1:
> 
> gdi,ttyp2,~/src/usr.sbin/sendmail/cf/cf,42>sudo scsi -f /dev/rsd0 -m 1
> AWRE (Auto Write Reallocation Enbld):  1
> ARRE (Auto Read Reallocation Enbld):  1
> 
> X = unit # of SCSI disk in question.
> 
> If bad blocks are poking through it's only going to get worse.
> 
> Doug White                              | University of Oregon
> Internet:  dwhite@resnet.uoregon.edu    | Residence Networking Assistant
> http://gladstone.uoregon.edu/~dwhite    | Computer Science Major
> 
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