From owner-freebsd-current@FreeBSD.ORG Fri Jun 9 02:45:57 2006 Return-Path: X-Original-To: freebsd-current@freebsd.org 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 6CF7516A41A; Fri, 9 Jun 2006 02:45:57 +0000 (UTC) (envelope-from doconnor@gsoft.com.au) Received: from cain.gsoft.com.au (cain.gsoft.com.au [203.31.81.10]) by mx1.FreeBSD.org (Postfix) with ESMTP id 9A19C43D92; Fri, 9 Jun 2006 02:45:55 +0000 (GMT) (envelope-from doconnor@gsoft.com.au) Received: from inchoate.gsoft.com.au (inchoate.gsoft.com.au [203.31.81.21]) (authenticated bits=0) by cain.gsoft.com.au (8.13.5/8.13.4) with ESMTP id k592jgCe095913 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-SHA bits=256 verify=NO); Fri, 9 Jun 2006 12:15:43 +0930 (CST) (envelope-from doconnor@gsoft.com.au) From: "Daniel O'Connor" To: freebsd-current@freebsd.org Date: Fri, 9 Jun 2006 12:15:33 +0930 User-Agent: KMail/1.9.3 References: <20060608132048.GD86198@garage.freebsd.pl> <20060608174113.GC1075@roadrunner.q.local> In-Reply-To: <20060608174113.GC1075@roadrunner.q.local> MIME-Version: 1.0 Content-Type: multipart/signed; boundary="nextPart1722409.6Rlg8ajgsb"; protocol="application/pgp-signature"; micalg=pgp-sha1 Content-Transfer-Encoding: 7bit Message-Id: <200606091215.41787.doconnor@gsoft.com.au> X-Spam-Score: -1.36 () ALL_TRUSTED X-Scanned-By: MIMEDefang 2.56 on 203.31.81.10 Cc: Pawel Jakub Dawidek Subject: Re: Data authentication for geli(8) committed to HEAD. X-BeenThere: freebsd-current@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Discussions about the use of FreeBSD-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Fri, 09 Jun 2006 02:45:57 -0000 --nextPart1722409.6Rlg8ajgsb Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Content-Disposition: inline On Friday 09 June 2006 03:11, Ulrich Spoerlein wrote: > I have an external HDD that I initially attached via Firewire, but I've > since switched to USB, as our firewire subsystem is less than rock Interesting. I find the reverse :) Then again I started using Firewire in 4.x where USB2.0 didn't exist and th= e=20 USB 1 code was kind of dodgy. > The question really is, are 512 byte disk writes considered to be some > kind of "atomic" as it is the smallest disk block size? What does the > ATA subsystem do with writes of 4096? Are they completed atomically too, > or not? I think that in reality with a modern high capacity disk you don't get atom= ic=20 writes at all because they all re-write whole tracks. Yes this violates the assumption soft updates makes, I believe the only way= =20 around it is to buy SCSI drives (not because they're SCSI per se, but becau= se=20 they're smaller capacity so they don't do this) =2D-=20 Daniel O'Connor software and network engineer for Genesis Software - http://www.gsoft.com.au "The nice thing about standards is that there are so many of them to choose from." -- Andrew Tanenbaum GPG Fingerprint - 5596 B766 97C0 0E94 4347 295E E593 DC20 7B3F CE8C --nextPart1722409.6Rlg8ajgsb Content-Type: application/pgp-signature -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.2.2 (FreeBSD) iD8DBQBEiODV5ZPcIHs/zowRAvnRAKCdbFsjpBtt0pzvmA2F6VZyQb7ElQCcDk6v K+pSiJ69ThtEBj5EcWABh9U= =KYEN -----END PGP SIGNATURE----- --nextPart1722409.6Rlg8ajgsb--