From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from relay.sgi.com (relay3.corp.sgi.com [198.149.34.15]) by oss.sgi.com (Postfix) with ESMTP id 603B57F6D for ; Mon, 8 Jul 2013 19:01:45 -0500 (CDT) Received: from cuda.sgi.com (cuda1.sgi.com [192.48.157.11]) by relay3.corp.sgi.com (Postfix) with ESMTP id EFFB7AC001 for ; Mon, 8 Jul 2013 17:01:41 -0700 (PDT) Received: from sandeen.net (sandeen.net [63.231.237.45]) by cuda.sgi.com with ESMTP id OxgItKuWLw2XCX2f for ; Mon, 08 Jul 2013 17:01:40 -0700 (PDT) Message-ID: <51DB52E1.8030508@sandeen.net> Date: Mon, 08 Jul 2013 19:01:37 -0500 From: Eric Sandeen MIME-Version: 1.0 Subject: Re: [PATCH] mkfs: add missing noalign suboption information References: <1373327110-5533-1-git-send-email-cmaiolino@redhat.com> In-Reply-To: <1373327110-5533-1-git-send-email-cmaiolino@redhat.com> List-Id: XFS Filesystem from SGI List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com To: Carlos Maiolino Cc: xfs@oss.sgi.com On 7/8/13 6:45 PM, Carlos Maiolino wrote: > Adds to the mkfs man page, information about noalign mkfs option which is > missing until now. > > Signed-off-by: Carlos Maiolino > --- > man/man8/mkfs.xfs.8 | 6 ++++++ > 1 file changed, 6 insertions(+) > > diff --git a/man/man8/mkfs.xfs.8 b/man/man8/mkfs.xfs.8 > index 04c19b4..2435814 100644 > --- a/man/man8/mkfs.xfs.8 > +++ b/man/man8/mkfs.xfs.8 > @@ -244,6 +244,12 @@ will automatically query the logical volume for appropriate > and > .B swidth > values. > +.TP > +.BI noalign > +This option is used to bypass data alignment configuration. In rare > +circunstances, data alignment might decrease performance, for such cases, > +use this option to avoid data alignment, this will set stripe unit and > +stripe width to 0. Thanks for this, Carlos. I think it might be better to just state plainly that it overrides automatic stripe unit detection, and leave the tuning / performance parts out. Most of the manpage today is more "what" than "why." So maybe simply: +This option disables automatic stripe geometry detection, and creates +the filesystem without stripe geometry even if the underlying storage +device reports this information. FWIW, there is a 'noalign' option for the realtime subvolume as well, and that should probably get documented too. -Eric > .RE > .TP > .B \-f > _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs