From owner-freebsd-questions Sun Apr 14 8:48:55 2002 Delivered-To: freebsd-questions@freebsd.org Received: from cactus.fi.uba.ar (cactus.fi.uba.ar [157.92.49.108]) by hub.freebsd.org (Postfix) with ESMTP id 4B1E737B405 for ; Sun, 14 Apr 2002 08:48:52 -0700 (PDT) Received: from cactus.fi.uba.ar (cactus.fi.uba.ar [157.92.49.108]) by cactus.fi.uba.ar (8.11.6/8.11.6) with ESMTP id g3EFj8V80863; Sun, 14 Apr 2002 12:45:08 -0300 (ART) (envelope-from fgleiser@cactus.fi.uba.ar) Date: Sun, 14 Apr 2002 12:45:07 -0300 (ART) From: Fernando Gleiser To: Gregory Keefe Cc: Subject: Re: Softupdates In-Reply-To: <002301c1e31e$1dbe2850$9865fea9@GPC> Message-ID: <20020414122514.E5464-100000@cactus.fi.uba.ar> MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-questions@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Sat, 13 Apr 2002, Gregory Keefe wrote: > FreeBSD Claim: > http://www.freebsd.org/features.html > Soft Updates allows improved file system performance without sacrificing > safety and reliability > > A Unix Expert's Claim: > http://cr.yp.to/qmail/faq/reliability.html > ``Do not use async or softupdates filesystems. If you do, and if your system > crashes at the wrong moment, you will lose [data].'' > > http://cr.yp.to/daemontools/multilog.html > ``Beware that NFS, async filesystems, and softupdates filesystems may > discard files that were not safely written to disk before an outage.'' > > Which should I believe? > > Sofupdates ensure that the *filesystem* is not corrupt after a crash. They don't say anything about *data*. You may lose data after a crash. If you are worried about losing data, you can mount the filesystems sync, but I don't think you'll like the performance. =0) IMHO, filesystem corruption is far worse than data loss of the last writes before the crash. Use softupdates on your filesystems and use a good UPS and hardware to minimize the risk of a crash. You have a good UPS on your production systems, dont you =0) Fer To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message