From owner-freebsd-current@FreeBSD.ORG Mon Apr 26 13:07:56 2010 Return-Path: Delivered-To: freebsd-current@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id E12941065670; Mon, 26 Apr 2010 13:07:56 +0000 (UTC) (envelope-from mavbsd@gmail.com) Received: from mail-ew0-f224.google.com (mail-ew0-f224.google.com [209.85.219.224]) by mx1.freebsd.org (Postfix) with ESMTP id 42A728FC1F; Mon, 26 Apr 2010 13:07:55 +0000 (UTC) Received: by ewy24 with SMTP id 24so3417040ewy.33 for ; Mon, 26 Apr 2010 06:07:50 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:received:received:sender:message-id:date:from :user-agent:mime-version:to:cc:subject:references:in-reply-to :x-enigmail-version:content-type:content-transfer-encoding; bh=3taVqRM+buewQXXUtEz8GyVSZa07awlY3KfEcxkaEzE=; b=ajf1d3QvddD6HJKfD7cCTfFRxyVc0d+bbv4wUu2Rb6EmM6/k3285NTnyR+ppw4rg9e QJREn/dty20LYzmWTGHqIPUNvHBeu9VeL0aPTS154ec9vqK2UGEKaLyvY/GyodxnyagR ISHxZQFQISEEXgm44UnBz4QtiX+Ue5Y0BxxQk= DomainKey-Signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=sender:message-id:date:from:user-agent:mime-version:to:cc:subject :references:in-reply-to:x-enigmail-version:content-type :content-transfer-encoding; b=FvHBMF2gf9T5m6Sabnb+rEOom/xlfrhbG+C/Wb77qaAGnkw4dY2LH2fYwHQ0n+x1/w gnA5Hl7OdMb5cmotlXG2HjiPo+BdoUU1bslDy+vBGd/FTnoygmMbARpc0F69qeDHMkh4 EtD2Ptjr2m2OVuYqVQOKTXrqzwLWhRhYGG8fM= Received: by 10.103.48.21 with SMTP id a21mr2241433muk.98.1272287270308; Mon, 26 Apr 2010 06:07:50 -0700 (PDT) Received: from mavbook.mavhome.dp.ua (pc.mavhome.dp.ua [212.86.226.226]) by mx.google.com with ESMTPS id j2sm16958160mue.23.2010.04.26.06.07.48 (version=SSLv3 cipher=RC4-MD5); Mon, 26 Apr 2010 06:07:49 -0700 (PDT) Sender: Alexander Motin Message-ID: <4BD59018.40805@FreeBSD.org> Date: Mon, 26 Apr 2010 16:07:36 +0300 From: Alexander Motin User-Agent: Thunderbird 2.0.0.23 (X11/20091212) MIME-Version: 1.0 To: Andrew Reilly References: <4BD06BD9.6030401@FreeBSD.org> <20100424193034.GA9853@alchemy.franken.de> <20100425080125.GA12283@duncan.reilly.home> In-Reply-To: <20100425080125.GA12283@duncan.reilly.home> X-Enigmail-Version: 0.96.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit Cc: freebsd-geom@freebsd.org, FreeBSD-Current , Marius Strobl Subject: Re: usb/da vs sata geometry calculations (was Re: Switchover to CAM ATA?) 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: Mon, 26 Apr 2010 13:07:57 -0000 Andrew Reilly wrote: > Was this the result of the umass/da driver having a different > synthetic geometry calculation routine than the SATA driver? ATA and SCSI disk drivers indeed have different geometry calculation algorithms. ATA fetches geometry from DEVICE IDENTIFY data, while SCSI seems just fakes them in many cases. > This was all on an 8-STABLE system about 400 days old, fwiw. > > Should I expect any on-going badness as a result of this > difference in "geometry" between two identical drives? I hope not. LBA-aware loaders should use LBA offsets of the partitions, which are not depending on geometry. -- Alexander Motin