Subject: Re: strange cpg number in disklabel
To: Frederick Bruckman <email@example.com>
From: Raketnet <firstname.lastname@example.org>
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.
Strange enough the default binary snapshot installation with sysinstall made a
disklabel using the value 86 for cpg.
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