From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from csamuel.org ([74.50.50.137]:34751 "EHLO csamuel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751259AbaAGFnn (ORCPT ); Tue, 7 Jan 2014 00:43:43 -0500 Received: from localhost (localhost [127.0.0.1]) by csamuel.org (Postfix) with ESMTP id C2F1640E2D for ; Tue, 7 Jan 2014 16:43:42 +1100 (EST) Received: from csamuel.org ([127.0.0.1]) by localhost (csamuel.org [127.0.0.1]) (amavisd-maia, port 10024) with LMTP id 31133-02 for ; Tue, 7 Jan 2014 16:43:42 +1100 (EST) Received: from [128.250.103.244] (unknown [128.250.103.244]) by csamuel.org (Postfix) with ESMTPSA id 41D9240E28 for ; Tue, 7 Jan 2014 16:43:42 +1100 (EST) Message-ID: <52CB940C.9010203@csamuel.org> Date: Tue, 07 Jan 2014 16:43:40 +1100 From: Chris Samuel MIME-Version: 1.0 To: linux-btrfs Subject: Re: btrfs raid1 and btrfs raid10 arrays NOT REDUNDANT References: <52C73987.7000106@jrs-s.net> <52C87A41.9030701@jrs-s.net> <05C97109-682D-4A62-B074-4EDCF8E9CE1E@colorremedies.com> <1416119.lWHlh5idGF@quad> <52CB031C.7060403@jrs-s.net> In-Reply-To: <52CB031C.7060403@jrs-s.net> Content-Type: text/plain; charset=ISO-8859-1 Sender: linux-btrfs-owner@vger.kernel.org List-ID: On 07/01/14 06:25, Jim Salter wrote: > FWIW, Ubuntu (and I presume Debian) will work just fine with a single / > on btrfs, single or multi disk. > > I currently have two machines booting to a btrfs-raid10 / with no > separate /boot, one booting to a btrfs single disk / with no /boot, and > one booting to a btrfs-raid10 / with an ext4-on-mdraid1 /boot. Actually I've run into a problem with grub where a fresh install cannot boot from a btrfs /boot if your first partition is not 1MB aligned (sector 2048) then there is then not enough space for it to store its btrfs code. :-( https://bugs.launchpad.net/ubuntu/+source/grub-installer/+bug/1266195 I don't want to move my first partition as it's a Dell special (type 'de') and I'm not sure what the impact would be, so I just created an ext4 /boot and the install then worked. Regarding RAID, yes I realise it's easy to do post-fact, in fact on the same test system I added an external USB2 drive to the root filesystem and rebalanced as RAID-1, worked nicely. I'm planning on adding dual SSDs as my OS disks to my desktop and this experiment was to learn whether the Kubuntu installer handled it yet and if not to do a quick practice of setting it up by hand. :-) All the best, Chris -- Chris Samuel : http://www.csamuel.org/ : Melbourne, VIC