filesystem size after newfs

[chris scott]

2009/8/11 mojo fms <fbsdlilly at gmail.com>

> On Mon, Aug 10, 2009 at 3:55 PM, Naeem Afzal <nafzal at hotmail.com> wrote:
>
> >
> >    I created this small partition of 512K bytes on disk, I am noticing
> > about 24% is used up before system can be mounted and used. My assumption
> > was about 4% is supposed to be used if minfree is set to 0.
> >
> >    #newfs -U -l -m 0 -n -o space /dev/ad1d
> >    /dev/ad1d: 0.5MB (1024 sectors) block size 16384, fragment size 2048
> > using 1 cylinder groups of 0.50MB, 32 blks, 64 inodes with soft updates
> >    super-block backups (for fsck -b #) at:
> >    160
> >    #mount /dev/ad1d /test
> >    #df -H /test
> >    Filesystem    Size    Used  Avail Capacity  Mounted on
> >    /dev/ad1d      391k    2.0k    389k    1%    /test
> >    Could someone explain where the 512-391=121K of disk space went to?
> What
> > is the relation between this used of space and total paritition size or
> is
> > it some fixed ratio?
> >    Thanks & Regards
> >     Naeem
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> 5% to root, and the rest i am assuming file system blocks.  Try making the
> 512k partition bigger accounting for those things and you should be able to
> get it really close to 512k available.
>
> --
> Who knew
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why do you want something that small? Could you not use an md device or
tmpfs, they would probably be more efficient