From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from cuda.sgi.com (cuda2.sgi.com [192.48.176.25]) by oss.sgi.com (8.14.3/8.14.3/SuSE Linux 0.8) with ESMTP id q8KC4TXT077508 for ; Thu, 20 Sep 2012 07:04:29 -0500 Received: from smtp4-g21.free.fr (smtp4-g21.free.fr [212.27.42.4]) by cuda.sgi.com with ESMTP id ubhZsJejWrQYrhQB for ; Thu, 20 Sep 2012 05:05:40 -0700 (PDT) Date: Thu, 20 Sep 2012 14:05:37 +0200 From: Emmanuel Florac Subject: Re: Questions on RAID alignment Message-ID: <20120920140537.11a50638@harpe.intellique.com> In-Reply-To: <505AF9EA.7030603@shiftmail.org> References: <505AF9EA.7030603@shiftmail.org> Mime-Version: 1.0 List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Sender: xfs-bounces@oss.sgi.com Errors-To: xfs-bounces@oss.sgi.com To: Spelic Cc: xfs@oss.sgi.com Le Thu, 20 Sep 2012 13:11:38 +0200 Spelic =E9crivait: > 1- Does XFS support alignment to concatenation RAIDs (e.g. linear > over raid1) similarly to striped ones? I am guessing probably su and > sw should not be specified and the agcount should be multiple of the > number of the concatenated devices, is that correct? No, it's better to set your sw/su accordingly to your RAID setup (example: 8 drives RAID-10 256k stripe -> su=3D256k,sw=3D4) and let mkfs.xfs determine itself how many ag it wants, to adapt it both to the striping and filesystem size. = > 2- Can mkfs parameters be altered after creation, e.g. after growing > a RAID and then growing the XFS fs, can I also alter su, sw, agcount > somehow? agcount will be adjusted by xfs_growfs AFAIK. For the other parameters, not so much. = > 3- I seem to remember there was an xattr that one could attach > to /home (if /home was under XFS) so that every user (subdir > of /home) would get a different AG in a different RAID device. I > cannot find that information anymore on the internet; could you > refresh my mind? > = I really have no idea on this. -- = ------------------------------------------------------------------------ Emmanuel Florac | Direction technique | Intellique | | +33 1 78 94 84 02 ------------------------------------------------------------------------ _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs