From owner-freebsd-questions@FreeBSD.ORG  Thu May 13 15:01:19 2004
Return-Path: <owner-freebsd-questions@FreeBSD.ORG>
Delivered-To: freebsd-questions@freebsd.org
Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125])
	by hub.freebsd.org (Postfix) with ESMTP id B1CC516A4CE
	for <freebsd-questions@freebsd.org>;
	Thu, 13 May 2004 15:01:19 -0700 (PDT)
Received: from pfepc.post.tele.dk (pfepc.post.tele.dk [195.41.46.237])
	by mx1.FreeBSD.org (Postfix) with ESMTP id 3041C43D41
	for <freebsd-questions@freebsd.org>;
	Thu, 13 May 2004 15:01:19 -0700 (PDT)
	(envelope-from xi@borderworlds.dk)
Received: from ferengi.borderworlds.dk (0x50a69807.arcnxx19.adsl-dhcp.tele.dk
	[80.166.152.7])
	by pfepc.post.tele.dk (Postfix) with ESMTP id 098E7262822
	for <freebsd-questions@freebsd.org>;
	Fri, 14 May 2004 00:01:17 +0200 (CEST)
Received: from borg.borderworlds.dk (localhost [127.0.0.1])
	by ferengi.borderworlds.dk (Postfix) with ESMTP id 3F73FB806
	for <freebsd-questions@freebsd.org>;
	Fri, 14 May 2004 00:01:17 +0200 (CEST)
Received: by borg.borderworlds.dk (Postfix, from userid 1001)
	id 0F3C2B823; Fri, 14 May 2004 00:01:17 +0200 (CEST)
Sender: xi@borderworlds.dk
To: freebsd-questions@freebsd.org
References: <40A32D0F.5050101@yahoo.co.uk>
	<200405132247.33270.peter.schuller@infidyne.com>
From: Christian Laursen <xi@borderworlds.dk>
Date: 14 May 2004 00:01:16 +0200
In-Reply-To: <200405132247.33270.peter.schuller@infidyne.com>
Message-ID: <86isf0dm1f.fsf@borg.borderworlds.dk>
Lines: 17
User-Agent: Gnus/5.09 (Gnus v5.9.0) Emacs/21.3
MIME-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Subject: Re: The journalling file system saga
X-BeenThere: freebsd-questions@freebsd.org
X-Mailman-Version: 2.1.1
Precedence: list
Reply-To: freebsd-questions@freebsd.org
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, 13 May 2004 22:01:19 -0000

Peter Schuller <peter.schuller@infidyne.com> writes:

[Problems with softupdates]

> Yet another problem is that an fsync() no longer guarantees that data is on 
> disk, even with write caching disabled on the media. This doesn't break 
> things like PostgreSQL provided that the order of writes is preserved, but it 
> does break things like MTA:s that want to guarantee that critical data has 
> been commited to persistent storage before signaling success to an external 
> entity (SMTP client).

fsync(2) works as advertised with softupdates enabled so that shouldn't cause
any problems for applications that are written properly.

-- 
Med venlig hilsen
    Christian Laursen