From mboxrd@z Thu Jan 1 00:00:00 1970 From: Luca Berra Subject: Re: Raid-10 mount at startup always has problem Date: Sat, 27 Oct 2007 09:57:06 +0200 Message-ID: <20071027075706.GB12053@percy.comedia.it> References: <46D49F1A.7030409@tmr.com> <46E4A39C.8040509@amfes.com> <46E4A5F0.9090407@sauce.co.nz> <46E4A7C3.1040902@amfes.com> <471F5542.3020504@amfes.com> <471FA485.6010705@tmr.com> <47202D17.3040000@amfes.com> <1193294406.10336.76.camel@firewall.xsintricity.com> <20071026091513.GB32550@percy.comedia.it> <20071026165340.GA30268@boogie.lpds.sztaki.hu> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Return-path: Content-Disposition: inline In-Reply-To: <20071026165340.GA30268@boogie.lpds.sztaki.hu> Sender: linux-raid-owner@vger.kernel.org To: linux-raid@vger.kernel.org List-Id: linux-raid.ids On Fri, Oct 26, 2007 at 06:53:40PM +0200, Gabor Gombas wrote: >On Fri, Oct 26, 2007 at 11:15:13AM +0200, Luca Berra wrote: > >> on a pc maybe, but that is 20 years old design. >> partition table design is limited because it is still based on C/H/S, >> which do not exist anymore. > >The MS-DOS format is not the only possible partition table layout. Other >formats such as GPT do not have such limitations. > >> Put a partition table on a big storage, say a DMX, and enjoy a 20% >> performance decrease. > >I assume your "big storage" uses some kind of RAID. Are your partitions >stripe-aligned? (Btw. that has nothing to do with partitions, LVM can >also suffer if PEs are not aligned). mine are, unfortunately the default is to start them at 32256 bytes into the device. >>> Oh, and let's not go into what can happen if you're talking about a dual >>> boot machine and what Windows might do to the disk if it doesn't think >>> the disk space is already spoken for by a linux partition. >> Why the hell should the existance of windows limit the possibility of >> linux working properly. what i am saying is that a dual boot machine is not the only scenario we have. >> On the opposite, i once inserted an mmc memory card, which had been >> initialized on my mobile phone, into the mmc slot of my laptop, and was >> faced with a load of error about mmcblk0 having an invalid partition >> table. Obviously it had none, it was a plain fat filesystem. >> Is the solution partitioning it? I don't think the phone would >> agree. > >Well, it said it could not find a valid partition change. That was the >truth. Why is it a problem if the kernel states a fact? it is random. reformatting it made the kernel message go away. i wonder if by chance something would decide it is a valid partition table.... -- Luca Berra -- bluca@comedia.it Communication Media & Services S.r.l. /"\ \ / ASCII RIBBON CAMPAIGN X AGAINST HTML MAIL / \