From owner-freebsd-questions Sat Apr 13 12:55:26 2002 Delivered-To: freebsd-questions@freebsd.org Received: from bingnet2.cc.binghamton.edu (bingnet2.cc.binghamton.edu [128.226.1.18]) by hub.freebsd.org (Postfix) with ESMTP id 7595337B419 for ; Sat, 13 Apr 2002 12:55:23 -0700 (PDT) Received: from onyx ([128.226.182.171]) by bingnet2.cc.binghamton.edu (8.11.6/8.11.6) with ESMTP id g3DJtLY07763; Sat, 13 Apr 2002 15:55:21 -0400 (EDT) Date: Sat, 13 Apr 2002 15:52:49 -0400 (EDT) From: Zhihui Zhang X-Sender: zzhang@onyx To: Gregory Keefe Cc: freebsd-questions@freebsd.org Subject: Re: Softupdates In-Reply-To: <002301c1e31e$1dbe2850$9865fea9@GPC> Message-ID: 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 IMHO, all file systems lie. When you write a piece of data to it, it holds it without committing to disk immediately. The purpose is to improve performance. You can always request synchronous I/O, but that will be a nightmare for performance. Anyway, how often does we have a power failure? -Zhihui 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? > > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-questions" in the body of the message