From owner-freebsd-questions  Fri May  8 14:01:21 1998
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Date: Fri, 8 May 1998 14:00:45 -0700 (PDT)
From: Doug White <dwhite@gdi.uoregon.edu>
Reply-To: Doug White <dwhite@resnet.uoregon.edu>
To: Clod Baldrick <baldrick@rmsq.com>
cc: freebsd-questions@FreeBSD.ORG
Subject: Re: Masking out bad blocks
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Message-ID: <Pine.BSF.3.96.980508135818.28068V-100000@gdi.uoregon.edu>
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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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