atom feed14 messages in org.freebsd.freebsd-questionsWhy is 'disklabel'ng a new drive so d...
FromSent OnAttachments
Marc G. FournierMar 28, 2007 8:26 pm 
Kris KennawayMar 28, 2007 8:41 pm 
Marc G. FournierMar 28, 2007 8:48 pm 
ill...@gmail.comMar 28, 2007 9:04 pm 
Jerry McAllisterMar 28, 2007 9:20 pm 
Jerry McAllisterMar 28, 2007 9:24 pm 
Jerry McAllisterMar 28, 2007 9:29 pm 
RWMar 28, 2007 9:48 pm 
Jerry McAllisterMar 28, 2007 10:13 pm 
Antony MawerMar 29, 2007 10:07 pm 
Jerry McAllisterMar 29, 2007 11:22 pm 
Antony MawerMar 29, 2007 11:55 pm 
Jerry McAllisterMar 30, 2007 3:09 pm 
Daniel ErikssonMar 31, 2007 9:35 am 
Subject:Why is 'disklabel'ng a new drive so difficult?
From:Jerry McAllister (jerr@msu.edu)
Date:Mar 28, 2007 10:13:12 pm
List:org.freebsd.freebsd-questions

On Wed, Mar 28, 2007 at 10:49:15PM +0100, RW wrote:

On Wed, 28 Mar 2007 17:19:12 -0400 Jerry McAllister <jerr@msu.edu> wrote:

Then, the only thing wrong is that your offsets should start at 0. They mean within the slice, not raw disk sector 0.

I was just looking at the bsdlable manpage, and it says:

"For partition `c', * will be interpreted as an offset of 0. The first partition should start at offset 16, because the first 16 sectors are reserved for metadata."

I normally use sysintall for new slices, but a few days ago I edited an old slice to turn the old root, swap, /tmp and /var partitions into a single partition d for a squid cache, and I ended-up with this:

$ bsdlabel /dev/ad0s2 # /dev/ad0s2: 8 partitions: # size offset fstype [fsize bsize bps/cpg] c: 141853950 0 unused 0 0 # ... d: 5242880 0 4.2BSD 2048 16384 28552 f: 16777216 5242880 4.2BSD 0 0 0 g: 119833854 22020096 4.2BSD 0 0 0

I'm wondering if I should put in an offset of 16 for the d partition

I think that is only true for some old stuff in old systems. I believe I saw somewhere that it only is meaningful it the -A option is used. It might also be meaningful for the so-called 'dangerously dedicated' disk where you don't use a slice, but the raw drive. But, I never start it at an offset of 16 - always 0 if my partition is within a slice.

////jerry

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