From owner-freebsd-stable  Sat Jul  7 16:57:57 2001
Delivered-To: freebsd-stable@freebsd.org
Received: from net.tamu.edu (net.tamu.edu [128.194.177.50])
	by hub.freebsd.org (Postfix) with ESMTP id 45F1237B401
	for <freebsd-stable@FreeBSD.ORG>; Sat,  7 Jul 2001 16:57:54 -0700 (PDT)
	(envelope-from daved@net.tamu.edu)
Received: by net.tamu.edu (Postfix, from userid 157)
	id 8111615891; Sat,  7 Jul 2001 18:57:53 -0500 (CDT)
Date: Sat, 7 Jul 2001 18:57:53 -0500
From: Dave Duchscher <daved@tamu.edu>
To: Dave Uhring <duhring@charter.net>
Cc: "Jim C. Nasby" <jim@nasby.net>, freebsd-stable@FreeBSD.ORG,
	Oliver Fromme <olli@secnetix.de>
Subject: Re: JFS
Message-ID: <20010707185753.B27481@net.tamu.edu>
Mail-Followup-To: Dave Uhring <duhring@charter.net>,
	"Jim C. Nasby" <jim@nasby.net>, freebsd-stable@FreeBSD.ORG,
	Oliver Fromme <olli@secnetix.de>
References: <200107071638.SAA19610@lurza.secnetix.de> <01070711475500.00362@dave> <3B476285.43347BA1@nasby.net> <000d01c1074e$49d31ba0$0300a8c0@uhring.com>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.2.5i
In-Reply-To: <000d01c1074e$49d31ba0$0300a8c0@uhring.com>; from duhring@charter.net on Sat, Jul 07, 2001 at 08:35:35PM -0500
Sender: owner-freebsd-stable@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-stable.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo?subject=subscribe%20freebsd-stable>
List-Unsubscribe: <mailto:majordomo?subject=unsubscribe%20freebsd-stable>
X-Loop: FreeBSD.ORG

On Sat, Jul 07, 2001 at 08:35:35PM -0500, Dave Uhring wrote:
>
> You seem to have missed the critical point of that paper.  When the
> system goes completely haywire and either crashes or locks up so hard
> that a manual reset is required, UFS/softupdates requires a substantial
> amount of time to run fsck.  If you have a very large filesystem, you
> then have to w....a....i....t until fsck completes.  And if you are
> lucky, it will not terminate with the suggestion that you run fsck by
> hand.  With a true journalling filesystem this wait is obviated.  The
> last transactions are rerun or truncated and the system boots up.

Just to bring up a point, Softupdates will also avoid the long fsck at
boot.  If I understand the papers I have read and with playing with
Softupdates on current, Softupdates leaves files system in a
consistent state so that the file-system can be mounted after a
crash/lockup/etc immediately and only a background fsck need be run to
free up left over pieces laying around.

You guys also might want to wonder over to Kirk's Softupdates site:

  http://www.McKusick.com/softdep/index.html

DaveD

To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-stable" in the body of the message