Subject: Re: strange cpg number in disklabel
To: Frederick Bruckman <fredb@immanent.net>
From: Raketnet <jordivvz@raketnet.nl>
List: current-users
Date: 04/28/2003 17:12:04
> On Mon, 28 Apr 2003, Raketnet wrote:
> 
> > After editing disklabel and setting the usual 86 cpg for a new partition, I
> > get after performing the command newfs another and strange cpg (cylinders per
> > group) number, 46376. Can anyone tell me please if this is normal in this "f"
> > partition from disklabel. I also tried the parameter -c with newfs trying to
> > force what I want but no way I can get it to 86.
> >
> > f:  39447954  40970286     4.2BSD   1024  8192 46376   # (Cyl. 40645*- 79779)
> 
>  Per newfs(8), the default is "the maximum allowed", since 
> about NetBSD-1.6. In other words, the value given in the label 
> is ignored. As I recall, this was changed about the time the 
> new dirpref code went in, to give new file systems the benefit 
> even if they still had the old label default of 16. "newfs 
> -c" works, except you should have been warned that 86 isn't 
> a multiple of 16. It may also be too small for a 20gb partition 
> with 8k blocksize. Try saner values, like 2048 for fragments,
>  16384 for blocksize, and at least 96 cpg.
> 
> Frederick


Strange enough the default binary snapshot installation with sysinstall made a 
disklabel using the value 86 for cpg.
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