From mboxrd@z Thu Jan 1 00:00:00 1970 From: NeilBrown Subject: Re: advanced partition format, mdadm, and raw disks Date: Tue, 5 Jul 2011 14:56:41 +1000 Message-ID: <20110705145641.3f8eb3db@notabene.brown> References: <1309796133.2766.63.camel@baal> <20110705103030.401066f6@notabene.brown> <1309840130.2865.5.camel@baal> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Return-path: In-Reply-To: <1309840130.2865.5.camel@baal> Sender: linux-raid-owner@vger.kernel.org To: "Tyler J. Wagner" Cc: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Tue, 05 Jul 2011 05:28:50 +0100 "Tyler J. Wagner" wrote: > On Tue, 2011-07-05 at 10:30 +1000, NeilBrown wrote: > > No "super" is mentioned here so it must be using 0.90 metadata. > > Ah. Damn that old Debian package. > > I'm concerned that this means the filesystem isn't aligned to the 4K > sector, and is therefore less efficient. Is 0.90 metadata at the > beginning or end of the disk? Is it a multiple of 4K in size? > 0.90 has data at the start and metadata at the end on a 64k aligned boundary. So if the partition is 4K aligned, everything else will be too. NeilBrown