From owner-freebsd-questions@FreeBSD.ORG  Wed Sep 21 09:48:28 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 6B179106566C
	for <freebsd-questions@freebsd.org>;
	Wed, 21 Sep 2011 09:48:28 +0000 (UTC)
	(envelope-from basarevych@gmail.com)
Received: from mail-vw0-f44.google.com (mail-vw0-f44.google.com
	[209.85.212.44])
	by mx1.freebsd.org (Postfix) with ESMTP id 283418FC18
	for <freebsd-questions@freebsd.org>;
	Wed, 21 Sep 2011 09:48:27 +0000 (UTC)
Received: by vws5 with SMTP id 5so2343993vws.17
	for <freebsd-questions@freebsd.org>;
	Wed, 21 Sep 2011 02:48:27 -0700 (PDT)
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma;
	h=mime-version:date:message-id:subject:from:to:content-type;
	bh=cLzPbwwrc9A/1ekRsfLqug71WPZWIe4joJPQnWUvfrs=;
	b=KWDsqiD/QrXodVBilGbRwMpVS40lUXMyWLwvysRHCffu9TxnwcGbKN6Rl+L5miCuuA
	LJklgJyoOfUghqA0JOOr/PfAIDZvzFUh4r/hJmrZDKVqDx+dvaIbOkAmsizI2rFKNQRF
	ABbiF/VGKY/vlODigGFPc2TM0LH+g+IoOCQqg=
MIME-Version: 1.0
Received: by 10.220.99.142 with SMTP id u14mr102880vcn.46.1316598505775; Wed,
	21 Sep 2011 02:48:25 -0700 (PDT)
Received: by 10.220.171.197 with HTTP; Wed, 21 Sep 2011 02:48:25 -0700 (PDT)
Date: Wed, 21 Sep 2011 12:48:25 +0300
Message-ID: <CANmv3=yuQudqqfj8xA3kQkH1XHjSBxgkR5zAB_jwpVWk9RxFeQ@mail.gmail.com>
From: Ross <basarevych@gmail.com>
To: freebsd-questions@freebsd.org
Content-Type: text/plain; charset=UTF-8
Subject: UFS journal size
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: Wed, 21 Sep 2011 09:48:28 -0000

Quoting the manpage:

         -s jsize  Specifies size of the journal if only one provider is
                       used for both data and journal.  The default is one
                       gigabyte.  Size should be chosen based on provider's
                       load, and not on its size; recommended minimum is twice
                       the size of the physical memory installed.  It is not
                       recommended to use gjournal for small file systems
                       (e.g.: only few gigabytes big).

My question is: if I have 4 or 8 GB of RAM should I create 8 or even
16 GB journals?.. This seems huge especially if the fs size without
journal is only 10 gigs. Or the recommended minimum is for systems low
on RAM?