Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751283AbVIEOPJ (ORCPT ); Mon, 5 Sep 2005 10:15:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1751279AbVIEOPI (ORCPT ); Mon, 5 Sep 2005 10:15:08 -0400 Received: from gate.in-addr.de ([212.8.193.158]:5250 "EHLO mx.in-addr.de") by vger.kernel.org with ESMTP id S1751266AbVIEOPG (ORCPT ); Mon, 5 Sep 2005 10:15:06 -0400 Date: Mon, 5 Sep 2005 16:14:32 +0200 From: Lars Marowsky-Bree To: Daniel Phillips , Andi Kleen Cc: linux clustering , akpm@osdl.org, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: GFS, what's remaining Message-ID: <20050905141432.GF5498@marowsky-bree.de> References: <20050901104620.GA22482@redhat.com> <20050901132104.2d643ccd.akpm@osdl.org> <200509030157.31581.phillips@istop.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <200509030157.31581.phillips@istop.com> X-Ctuhulu: HASTUR User-Agent: Mutt/1.5.10i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1449 Lines: 36 On 2005-09-03T01:57:31, Daniel Phillips wrote: > The only current users of dlms are cluster filesystems. There are zero users > of the userspace dlm api. That is incorrect, and you're contradicting yourself here: > What does have to be resolved is a common API for node management. It is not > just cluster filesystems and their lock managers that have to interface to > node management. Below the filesystem layer, cluster block devices and > cluster volume management need to be coordinated by the same system, and > above the filesystem layer, applications also need to be hooked into it. > This work is, in a word, incomplete. The Cluster Volume Management of LVM2 for example _does_ use simple cluster-wide locks, and some OCFS2 scripts, I seem to recall, do too. (EVMS2 in cluster-mode uses a verrry simple locking scheme which is basically operated by the failover software and thus uses a different model.) Sincerely, Lars Marowsky-Br?e -- High Availability & Clustering SUSE Labs, Research and Development SUSE LINUX Products GmbH - A Novell Business -- Charles Darwin "Ignorance more frequently begets confidence than does knowledge" - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/