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Date:      Wed, 22 Mar 2000 21:01:07 -0700
From:      Warner Losh <imp@village.org>
To:        Doug Barton <Doug@gorean.org>
Cc:        Vivek Khera <khera@kciLink.com>, stable@FreeBSD.ORG
Subject:   Re: "dangerously dedicated" 
Message-ID:  <200003230401.VAA36386@harmony.village.org>
In-Reply-To: Your message of "Wed, 22 Mar 2000 19:53:44 PST." <38D99548.3201BC6D@gorean.org> 
References:  <38D99548.3201BC6D@gorean.org>  <14552.57732.739752.665443@onceler.kcilink.com> <4.3.2.20000321160347.00ad9b20@207.227.119.2> <Your message of "Sun, 19 Mar 2000 12:26:20 EST." <38D50DBC.88FA8E4D@glue.umd.edu> <38D50DBC.88FA8E4D@glue.umd.edu> <38D3AB72.366D851D@glue.umd.edu> <Pine.BSF.4.21.0003151354390.1980-100000@dt051n0b.san.rr.com> <200003152159.OAA89926@harmony.village.org> <38D03E64.3D17FC34@glue.umd.edu> <200003190433.VAA04863@harmony.village.org> <200003212255.PAA26291@harmony.village.org> <200003222301.QAA34410@harmony.village.org> 

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In message <38D99548.3201BC6D@gorean.org> Doug Barton writes:
: 	I'm curious, what kind of problems have you had, and how is using the
: compatability slice an improvement? I've always used "dangerously
: dedicated" on my freebsd-only disks, and I've never had a problem. 

I've had two classes of problems.

First, I've needed to set a special disk geometry in the fdisk
partition.  I'm not sure why it matters, but it seems to make a big
difference on some of my isa scsi machines.  I've also had problems
with partitions starting at offset 0.  While ufs does offset things by 
16 blocks, and the boot1 bootblock seems to have the fdisk partition
table encoded in it (well, at least it seems to preserve what's there, 
if anything), I've had some problems that went away when I went to
having a fdisk partition and starting at an offset of 16 or so.  Most
of these experiences were in the 1.x and 2.0 days.  Bruce's slice code 
has vastly improved the situation.

The second class of problems came into play when I later desided to
install Win95 on some of may machines.  Its installation program did
bad things to the dangerously dedicated disks.

Warner


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