From owner-freebsd-current Sat Jan 25 10:50:12 2003 Delivered-To: freebsd-current@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id B49AE37B401 for ; Sat, 25 Jan 2003 10:50:11 -0800 (PST) Received: from rootlabs.com (root.org [67.118.192.226]) by mx1.FreeBSD.org (Postfix) with SMTP id 44AC543F18 for ; Sat, 25 Jan 2003 10:50:07 -0800 (PST) (envelope-from nate@rootlabs.com) Received: (qmail 80015 invoked by uid 1000); 25 Jan 2003 18:50:02 -0000 Date: Sat, 25 Jan 2003 10:50:02 -0800 (PST) From: Nate Lawson To: David Schultz Cc: current@FreeBSD.ORG Subject: Re: I've just had a massive file system crash In-Reply-To: <20030125070352.GA933@HAL9000.homeunix.com> Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-current@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Fri, 24 Jan 2003, David Schultz wrote: > Thus spake Greg Lehey : > > I've been thinking about what happened, and I have a possibility: the > > session before shutdown included a lot of writing to that file system, > > and I did a shutdown -p. It's possible that the shutdown powered off > > the system before the disk had flushed its cache. For the moment I'm > > avoiding shutdown -p, but when I get home I'll try to provoke it > > again. > > FreeBSD's ``fix'' for this problem is the same as Windows 98's. > Specifically, there is a 5-second delay (tuneable: > kern.shutdown.poweroff_delay) after all buffers are flushed but > before the power is cut. Maybe we ought to be sending FLUSH > CACHE commands to all drives and waiting for them to finish. da(4) does a SYNC CACHE (see daclose() and dashutdown()). -Nate To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-current" in the body of the message