From owner-freebsd-questions  Tue Jun 26 12:28:10 2001
Delivered-To: freebsd-questions@freebsd.org
Received: from ptavv.es.net (ptavv.es.net [198.128.4.29])
	by hub.freebsd.org (Postfix) with ESMTP id 6080F37B405
	for <freebsd-questions@FreeBSD.ORG>; Tue, 26 Jun 2001 12:28:07 -0700 (PDT)
	(envelope-from oberman@ptavv.es.net)
Received: from ptavv.es.net (localhost [127.0.0.1])
	by ptavv.es.net (8.10.1/8.10.1) with ESMTP id f5QJRmc06958;
	Tue, 26 Jun 2001 12:27:49 -0700 (PDT)
Message-Id: <200106261927.f5QJRmc06958@ptavv.es.net>
To: Andrew Reid <andrew.reid@plug.cx>
Cc: freebsd-questions@FreeBSD.ORG
Subject: Re: FreeBSD and surviving unclean shutdowns 
In-reply-to: Your message of "26 Jun 2001 11:44:08 +0930."
             <993521648.1058.8.camel@percible.alfred.cx> 
Date: Tue, 26 Jun 2001 12:27:48 -0700
From: "Kevin Oberman" <oberman@es.net>
Sender: owner-freebsd-questions@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-questions.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-questions>
List-Unsubscribe: <mailto:majordomo?subject=unsubscribe%20freebsd-questions>
X-Loop: FreeBSD.ORG

> From: Andrew Reid <andrew.reid@plug.cx>
> Date: 26 Jun 2001 11:44:08 +0930
> Sender: owner-freebsd-questions@FreeBSD.ORG
> 
> While I am resurecting one of my mail servers (which is currently
> running Linux) the thought crossed my mind "How would FreeBSD cope with
> this situation?"
> 
> This server is running Software-RAID on a (patched for RAID) 2.2 kernel,
> and last night, the power went out for about three hours. My UPS only
> lasted for 2 of them.
> 
> How does FreeBSD cope with these sort of things? My Cache server took
> about an hour-and-a-half of fsck.ext2'ing to come back to a useable
> state.

Use softupdates. This will both improve the chances of no data loss
and will (purportedly) make fsck run faster.

See the tunefs man page for how to turn on softupdates on a file
system. (Note: you turn it on on a mount point (e.g. /usr), not a
partition (/dev/aac0s1e). It is non-volatile. Turn it on for a file
system and it will stay on after a reboot.

When V5.0 comes out next year, it will do fsck in the background since
there is no reason to run fsck on a softupdate file system before
starting to use it.

R. Kevin Oberman, Network Engineer
Energy Sciences Network (ESnet)
Ernest O. Lawrence Berkeley National Laboratory (Berkeley Lab)
E-mail: oberman@es.net			Phone: +1 510 486-8634

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