From owner-freebsd-questions@FreeBSD.ORG  Thu Jun  9 08:31:43 2011
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 8AD1F1065672
	for <freebsd-questions@freebsd.org>;
	Thu,  9 Jun 2011 08:31:43 +0000 (UTC)
	(envelope-from freebsd@edvax.de)
Received: from mx01.qsc.de (mx01.qsc.de [213.148.129.14])
	by mx1.freebsd.org (Postfix) with ESMTP id 4E4BD8FC12
	for <freebsd-questions@freebsd.org>;
	Thu,  9 Jun 2011 08:31:43 +0000 (UTC)
Received: from r55.edvax.de (port-92-195-63-204.dynamic.qsc.de [92.195.63.204])
	by mx01.qsc.de (Postfix) with ESMTP id EC5433C9BF;
	Thu,  9 Jun 2011 10:31:41 +0200 (CEST)
Received: from r55.edvax.de (localhost [127.0.0.1])
	by r55.edvax.de (8.14.2/8.14.2) with SMTP id p598VfS5001993;
	Thu, 9 Jun 2011 10:31:41 +0200 (CEST)
	(envelope-from freebsd@edvax.de)
Date: Thu, 9 Jun 2011 10:31:40 +0200
From: Polytropon <freebsd@edvax.de>
To: Frank Bonnet <f.bonnet@esiee.fr>
Message-Id: <20110609103140.a942bea7.freebsd@edvax.de>
In-Reply-To: <4DF08287.4050004@esiee.fr>
References: <4DF08287.4050004@esiee.fr>
Organization: EDVAX
X-Mailer: Sylpheed 2.4.7 (GTK+ 2.12.1; i386-portbld-freebsd7.0)
Mime-Version: 1.0
Content-Type: text/plain; charset=US-ASCII
Content-Transfer-Encoding: 7bit
Cc: freebsd-questions@freebsd.org
Subject: Re: make one partition with two existing ?
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.5
Precedence: list
Reply-To: Polytropon <freebsd@edvax.de>
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: Thu, 09 Jun 2011 08:31:43 -0000

On Thu, 09 Jun 2011 10:21:27 +0200, Frank Bonnet <f.bonnet@esiee.fr> wrote:
> Hello
> 
> I have a raid 5 array ( HP hardware managed ) that contains the 
> following partitions
> 
> -- Filesystem       Size    Used   Avail Capacity  Mounted on
> /dev/aacd0s1a    1.9G    306M    1.5G    17%    /
> devfs            1.0K    1.0K      0B   100%    /dev
> /dev/aacd0s1g     10G    7.2M    9.3G     0%    /tmp
> /dev/aacd0s1e    609G    559G    1.5G   100%    /mnt
> /dev/aacd0s1d     97G     12G     77G    14%    /usr
> /dev/aacd0s1f    610G    5.3G    556G     1%    /var
> 
> What I would like to do is
> 
> 1 - delete the /mnt partition
> 2 - extend the /var partition with the free space left by /mnt
> 
> Is it faisable without destroying the /var data ?

Shpuld be possible in few steps.

1. Unmount /var and dump its content, e. g.
	# umount /var
	# dump -0a -f /usr/var.dump /dev/aacd0s1f

If you can't unmount /var, see "man dump" for the -L option.

2. Delete the /dev/aacd0s1e and /dev/aacd0s1f partition, e. g.
   using sysinsall.

3. Create a new partition /dev/aacd0s1e with the size of the
   former /dev/aacd0s1e + /dev/aacd0s1f, e. g. using sysinstall
   or bsdlabel.

4. Initialize the new partition /dev/aacd0s1e, e. g.
	# newfs -U /dev/aacd0s1e
   Use further tunefs commands if required.

5. Mount it and restore from dump.
	# mount /dev/aacd0s1e /var
	# cd /var
	# restore -r -f /usr/var.dump

Finally you can remove /usr/var.dump. And make a change to
/etc/fstab for the new setting.

The whole work is best done in single user mode so there
won't be requests for writing things to /var.





-- 
Polytropon
Magdeburg, Germany
Happy FreeBSD user since 4.0
Andra moi ennepe, Mousa, ...