From owner-svn-src-head@FreeBSD.ORG Sat Jul 25 04:38:40 2009 Return-Path: Delivered-To: svn-src-head@FreeBSD.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id DAD4A106566C; Sat, 25 Jul 2009 04:38:40 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from harmony.bsdimp.com (bsdimp.com [199.45.160.85]) by mx1.freebsd.org (Postfix) with ESMTP id 8B9A38FC22; Sat, 25 Jul 2009 04:38:40 +0000 (UTC) (envelope-from imp@bsdimp.com) Received: from localhost (localhost [127.0.0.1]) by harmony.bsdimp.com (8.14.3/8.14.1) with ESMTP id n6P4bn8D004712; Fri, 24 Jul 2009 22:37:50 -0600 (MDT) (envelope-from imp@bsdimp.com) Date: Sat, 25 Jul 2009 00:14:17 -0400 (EDT) Message-Id: <20090725.001417.-1417608789.imp@bsdimp.com> To: scottl@samsco.org From: "M. Warner Losh" In-Reply-To: <4A6A855C.7090003@samsco.org> References: <4A6A7F2D.90807@samsco.org> <20090724.235420.319856209.imp@bsdimp.com> <4A6A855C.7090003@samsco.org> X-Mailer: Mew version 5.2 on Emacs 21.3 / Mule 5.0 (SAKAKI) Mime-Version: 1.0 Content-Type: Text/Plain; charset=us-ascii Content-Transfer-Encoding: 7bit Cc: svn-src-head@FreeBSD.org, mav@FreeBSD.org, src-committers@FreeBSD.org, svn-src-all@FreeBSD.org, cperciva@FreeBSD.org Subject: Re: svn commit: r195817 - head/usr.sbin/sysinstall X-BeenThere: svn-src-head@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: SVN commit messages for the src tree for head/-current List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Sat, 25 Jul 2009 04:38:41 -0000 In message: <4A6A855C.7090003@samsco.org> Scott Long writes: : M. Warner Losh wrote: : > In message: <4A6A7F2D.90807@samsco.org> : > Scott Long writes: : > : M. Warner Losh wrote: : > : > In message: <4A68DA56.60301@samsco.org> : > : > Scott Long writes: : > : > : M. Warner Losh wrote: : > : > : > In message: <4A66D0F4.4030108@FreeBSD.org> : > : > : > Alexander Motin writes: : > : > : > : Colin Percival wrote: : > : > : > : > Author: cperciva : > : > : > : > Date: Wed Jul 22 03:50:54 2009 : > : > : > : > New Revision: 195817 : > : > : > : > URL: http://svn.freebsd.org/changeset/base/195817 : > : > : > : > : > : > : > : > Log: : > : > : > : > Remove the "dedicated disk mode" partitioning option from sysinstall, in : > : > : > : > both the disk partitioning screen (the 'F' key) and via install.cfg (the : > : > : > : > VAR_DEDICATED_DISK option). This functionality is currently broken in 8.x : > : > : > : > due to libdisk and geom generating different partition names; this commit : > : > : > : > merely acts to help steer users away from the breakage. : > : > : > : > : > : > : > : > Submitted by: randi : > : > : > : > Approved by: re (kensmith) : > : > : > : > : > : > : > : > Modified: : > : > : > : > head/usr.sbin/sysinstall/disks.c : > : > : > : : > : > : > : Is there any other way to not align FS block to the ugly legacy 63 : > : > : > : sectors per track boundary with sysinstall now? I think RAIDs won't be : > : > : > : happy. May be it would be better to fix it? : > : > : > : > : > : > The reason we do it like this is because the boot blocks occupy the : > : > : > first cylinder group. Which with today's fake goemetry is 63 : > : > : > blocks... : > : > : > : > : > : : > : > : I already covered this. Unfortunately, Randi didn't take my bait. : > : > : Anyways, '63' is a minimum, it's not a singular value. It's also : > : > : an incredibly bad default. : > : > : > : > Yes. 256 is just as good as 63, unless the geometry reports more than : > : > 256 heads, which I don't think is possible... : > : > : > : > Warner : > : : > : If there is a BIOS in existence that can't find sector 256, then it : > : likely can't boot off of anything other than partition 1 in the fdisk : > : table. I bet that bugs like that were likely caught 15-20 years ago. : > : > I think you were missing the point I was trying to make, I must have : > been unclear. : > : > If there were more than 256 sectors in the first cylinder, then : > starting at 256 would overlap. This is largely a theoretical : > problem, I think, since I don't think that the BIOS can report a : > geometry > 64. : > : > The only issue that I can think of is that FreeBSD's fdisk wants to : > have things on cylinder boundaries, which 256 isn't, so fdisk will : > bitch and moan... : > : > Warner : : Ah, we will never be freed of the CHS bonds, will we. Oh well. Well, we could make it not bitch, except in extra picky mode :) Warner