From owner-freebsd-questions@FreeBSD.ORG  Sun Jul  8 07:31:06 2012
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34])
	by hub.freebsd.org (Postfix) with ESMTP id 001671065672
	for <freebsd-questions@freebsd.org>;
	Sun,  8 Jul 2012 07:31:05 +0000 (UTC)
	(envelope-from bonomi@mail.r-bonomi.com)
Received: from mail.r-bonomi.com (mx-out.r-bonomi.com [204.87.227.120])
	by mx1.freebsd.org (Postfix) with ESMTP id 97CA18FC0C
	for <freebsd-questions@freebsd.org>;
	Sun,  8 Jul 2012 07:31:05 +0000 (UTC)
Received: (from bonomi@localhost)
	by mail.r-bonomi.com (8.14.4/rdb1) id q687Ue3H072127;
	Sun, 8 Jul 2012 02:30:40 -0500 (CDT)
Date: Sun, 8 Jul 2012 02:30:40 -0500 (CDT)
From: Robert Bonomi <bonomi@mail.r-bonomi.com>
Message-Id: <201207080730.q687Ue3H072127@mail.r-bonomi.com>
To: guru@unixarea.de
In-Reply-To: <20120708064451.GB2365@tinyCurrent>
Cc: freebsd-questions@freebsd.org
Subject: Re: df(1) and missing space in partition /dev/ada0p2
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
List-Id: User questions <freebsd-questions.freebsd.org>
List-Unsubscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=unsubscribe>
List-Archive: <http://lists.freebsd.org/pipermail/freebsd-questions>
List-Post: <mailto:freebsd-questions@freebsd.org>
List-Help: <mailto:freebsd-questions-request@freebsd.org?subject=help>
List-Subscribe: <http://lists.freebsd.org/mailman/listinfo/freebsd-questions>, 
	<mailto:freebsd-questions-request@freebsd.org?subject=subscribe>
X-List-Received-Date: Sun, 08 Jul 2012 07:31:06 -0000

> From owner-freebsd-questions@freebsd.org  Sun Jul  8 01:46:23 2012
> Date: Sun, 8 Jul 2012 08:44:51 +0200
> From: Matthias Apitz <guru@unixarea.de>
> To: freebsd-questions@freebsd.org
> Subject: df(1) and missing space in partition /dev/ada0p2
>
>
> Hello,
>
> I hace setup a fresh 10.0-CURRENT, this time using gpart(8) and I do not 
> understand why the sum of Used and Avail does not equal to the full space 
> of /dev/ada0p2:
>

A traditional UFS filesstem reserves the last 10% of the disk capacity for 
the exclusive use of the superuser.  'Avail' represents the space that is
available to _any_ user.  Thus, on an absolutely _empty_ filesystem,
'avail' will be only 90% of 'total'.

'man tunefs' and see 'minfree' for  the gory details.