CLI filesystem format tool

Jerry McAllister jerrymc at
Mon Apr 30 03:02:21 UTC 2007

On Sun, Apr 29, 2007 at 06:16:39PM -0400, Kris Kennaway wrote:

> On Sun, Apr 29, 2007 at 03:53:19PM -0600, Chad Perrin wrote:
> > Is there a simple command line tool in FreeBSD for creating a filesystem
> > on an already extant slice?
> > 
> > I'm working on a system with three main slices -- ad0s1, ad0s2, and
> > ad0s3.  The ad0s2 slice is further split up into the default parts of a
> > FreeBSD install.  The ad0s1 slice is in use by another OS.  The ad0s3
> > slice has nothing of value on it, and I want to make it a FreeBSD-native
> > filesystem then mount it at /usr/home.
> > 
> > I've been hoping to find something akin to the Linux tool mkfs for this
> > purpose, but so far have come up empty.  Isn't there something that
> > works similarly to that?  Example:

I would suggest that you first use bsdlabel to create a single partition
on that slice.   You can use the a: partition, or if you feel squimish
about using that one that is traditionally used for root, then use
the d: partition.  Do this:

   bsdlabel -w ad0s3            To initialize a partition label, then
   bsdlabel -e ad0s3

You enter an edit more.   Just duplicate the c: line 
  --Do NOT change the c: line--
edit that duplicate line and make it a: or d: or whatever.
Change the tuype to BSD4.2
You can add values for  [fsize bsize bps/cpg],    maybe to:
                         2048  16384  28552
But I think you can just leave them blank.
write/quit the edit session and the label is written.

Then you need to run newfs on that new partition.

   newfs /dev/ad0s3a   or   newfs /dev/ad0s3d    if you named it d:

Then, just edit /etc/fstab to make it mount at boot time
and mount it up.   If you already have stuff in /home, then you will
need to make one of them a temporary mount somewhere to move stuff over.


> > 
> >   command /dev/ad0s3 fstype
> newfs
> Kris
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