Return-Path: linux-nfs-owner@vger.kernel.org Received: from bombadil.infradead.org ([198.137.202.9]:48318 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751628Ab3JCNRw (ORCPT ); Thu, 3 Oct 2013 09:17:52 -0400 Date: Thu, 3 Oct 2013 06:17:50 -0700 From: Christoph Hellwig To: Ric Wheeler Cc: Benny Halevy , Christoph Hellwig , "J. Bruce Fields" , linux-nfs@vger.kernel.org, Steven Whitehouse , Bob Peterson , Abhijith Das , Andrew Price , Paul Evans Subject: Re: [PATCH RFC v0 05/49] pnfsd: introduce pnfsd header files Message-ID: <20131003131750.GA23408@infradead.org> References: <52481B11.2080407@primarydata.com> <20130929122130.GI21083@infradead.org> <20130929123553.GA7510@infradead.org> <20131001203047.GH16245@pad.fieldses.org> <524C0556.9070705@primarydata.com> <20131002160759.GB27988@infradead.org> <524D0873.40602@primarydata.com> <20131003095511.GA30147@infradead.org> <524D6312.7020709@primarydata.com> <524D6D38.1040506@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii In-Reply-To: <524D6D38.1040506@redhat.com> Sender: linux-nfs-owner@vger.kernel.org List-ID: On Thu, Oct 03, 2013 at 09:12:24AM -0400, Ric Wheeler wrote: > >>>Which in-tree or soon in-tree filesystem do you care about? And why > >>>don't we see pnfs support for it submitted instead of the fairly useless > >>>gfs2 support? > >I picked gfs2 as the initial use case for simplicity and ease of review. > >If there is a rough consensus that it's useless and not worthy of inclusion > >then the one we care about the most is exofs that has a more complete pnfs > >implementation. > > > >Benny > > > > I don't see having GFS2 supported as a base for pNFS as useless. > Christoph, is this a concern about GFS2 being too complicated for > normal deployment or a lack in the pNFS support on top of it? Fairly useless was specific to the particular implementation: - which in the stipped down version here only supports DS access for reads - which in the previous version showed worse performance than always going through the MDS I don't have a problem with using GFS2 by itself, but any implementation proposed should actually show signifiant real life benefits before it gets merged.