From owner-freebsd-current@FreeBSD.ORG  Sat Jan  2 09:41:58 2010
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To: Ulrich =?utf-8?B?U3DDtnJsZWlu?= <uqs@spoerlein.net>
From: "Poul-Henning Kamp" <phk@phk.freebsd.dk>
In-Reply-To: Your message of "Sat, 02 Jan 2010 06:08:44 +0100."
	<20100102050843.GI3508@acme.spoerlein.net> 
Date: Sat, 02 Jan 2010 09:42:34 +0000
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Cc: Alexander Motin <mav@freebsd.org>, Miroslav Lachman <000.fbsd@quip.cz>,
	Thomas Backman <serenity@exscape.org>,
	freebsd-current@freebsd.org, freebsd-arch@freebsd.org,
	Pieter de Goeje <pieter@degoeje.nl>
Subject: Re: File system blocks alignment 
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In message <20100102050843.GI3508@acme.spoerlein.net>, Ulrich =?utf-8?B?U3DDtnJ
sZWlu?= writes:

>Sysinstall, fdisk, gpart
>and bsdlabel should all display some fat warning if partition/label
>alignment is not, say at 256kB (a common stripe size, right?) 

You overlook that MBR/Fdisk requires bootable slices to start at a
"track".  That means that the propper slice-alignmen typically
will be 8*63=504 sectors.

Unless you want to explore how many BIOS'es still are stupid about
this...

-- 
Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk@FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe    
Never attribute to malice what can adequately be explained by incompetence.