From owner-freebsd-stable@FreeBSD.ORG Sat Sep 27 07:36:22 2008 Return-Path: Delivered-To: freebsd-stable@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 2C4071065686 for ; Sat, 27 Sep 2008 07:36:22 +0000 (UTC) (envelope-from peterjeremy@optushome.com.au) Received: from mail17.syd.optusnet.com.au (mail17.syd.optusnet.com.au [211.29.132.198]) by mx1.freebsd.org (Postfix) with ESMTP id ACFCC8FC1B for ; Sat, 27 Sep 2008 07:36:21 +0000 (UTC) (envelope-from peterjeremy@optushome.com.au) Received: from server.vk2pj.dyndns.org (c122-106-215-175.belrs3.nsw.optusnet.com.au [122.106.215.175]) by mail17.syd.optusnet.com.au (8.13.1/8.13.1) with ESMTP id m8R7aIAC031314 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Sat, 27 Sep 2008 17:36:19 +1000 X-Bogosity: Ham, spamicity=0.000000 Received: from server.vk2pj.dyndns.org (localhost.vk2pj.dyndns.org [127.0.0.1]) by server.vk2pj.dyndns.org (8.14.2/8.14.2) with ESMTP id m8R7aHbq089886; Sat, 27 Sep 2008 17:36:17 +1000 (EST) (envelope-from peter@server.vk2pj.dyndns.org) Received: (from peter@localhost) by server.vk2pj.dyndns.org (8.14.2/8.14.2/Submit) id m8R7aHnK089881; Sat, 27 Sep 2008 17:36:17 +1000 (EST) (envelope-from peter) Date: Sat, 27 Sep 2008 17:36:17 +1000 From: Peter Jeremy To: Jeremy Chadwick Message-ID: <20080927073616.GP15376@server.vk2pj.dyndns.org> References: <20080921213426.GA13923@0lsen.net> <20080921215203.GC9494@icarus.home.lan> <20080921215930.GA25826@0lsen.net> <20080921220720.GA9847@icarus.home.lan> <249873145.20080926213341@takeda.tk> <20080927051413.GA42700@icarus.home.lan> <765067435.20080926223557@takeda.tk> <20080927064417.GA43638@icarus.home.lan> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="InRyi6yyXSYzKD4c" Content-Disposition: inline In-Reply-To: <20080927064417.GA43638@icarus.home.lan> X-PGP-Key: http://members.optusnet.com.au/peterjeremy/pubkey.asc User-Agent: Mutt/1.5.18 (2008-05-17) Cc: Derek Kuli??ski , freebsd-stable@freebsd.org, Clint Olsen Subject: Re: UNEXPECTED SOFT UPDATE INCONSISTENCY; RUN fsck MANUALLY X-BeenThere: freebsd-stable@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Production branch of FreeBSD source code List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 27 Sep 2008 07:36:22 -0000 --InRyi6yyXSYzKD4c Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable On 2008-Sep-26 23:44:17 -0700, Jeremy Chadwick wrote: >On Fri, Sep 26, 2008 at 10:35:57PM -0700, Derek Kuli??ski wrote: >> As far as I know (at least ideally, when write caching is disabled) =2E.. >FreeBSD atacontrol does not let you toggle such features (although "cap" >will show you if feature is available and if it's enabled or not). True but it can be disabled via the loader tunable hw.ata.wc (at least in theory - apparently some drives don't obey the cache disable command to make them look better in benchmarks). >Users using SCSI will most definitely have the ability to disable >said feature (either via SCSI BIOS or via camcontrol). Soft-updates plus write caching isn't an issue with tagged queueing (which is standard for SCSI) because the critical point for soft-updates is knowing when the data is written to non-volatile storage - which tagged queuing provides. --=20 Peter Jeremy Please excuse any delays as the result of my ISP's inability to implement an MTA that is either RFC2821-compliant or matches their claimed behaviour. --InRyi6yyXSYzKD4c Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v2.0.9 (FreeBSD) iEYEARECAAYFAkjd4nAACgkQ/opHv/APuIfu8ACgiVxzBQXk8Nv7v3n9qQ70Ht1k 9q0AmgMzIKxTvks9+CXUyGENwP7FJTN7 =y0+F -----END PGP SIGNATURE----- --InRyi6yyXSYzKD4c--