Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S261399AbVD0NmA (ORCPT ); Wed, 27 Apr 2005 09:42:00 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S261547AbVD0Nl7 (ORCPT ); Wed, 27 Apr 2005 09:41:59 -0400 Received: from gate.in-addr.de ([212.8.193.158]:52158 "EHLO mx.in-addr.de") by vger.kernel.org with ESMTP id S261399AbVD0Nl5 (ORCPT ); Wed, 27 Apr 2005 09:41:57 -0400 Date: Wed, 27 Apr 2005 15:23:43 +0200 From: Lars Marowsky-Bree To: Mark Fasheh , David Teigland Cc: Wim Coekaerts , linux-kernel@vger.kernel.org, akpm@osdl.org Subject: Re: [PATCH 0/7] dlm: overview Message-ID: <20050427132343.GX4431@marowsky-bree.de> References: <20050425151136.GA6826@redhat.com> <20050425203952.GE25002@ca-server1.us.oracle.com> <20050426053930.GA12096@redhat.com> <20050426184845.GA938@ca-server1.us.oracle.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <20050426184845.GA938@ca-server1.us.oracle.com> X-Ctuhulu: HASTUR User-Agent: Mutt/1.5.6i Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1288 Lines: 34 On 2005-04-26T11:48:45, Mark Fasheh wrote: > Resource lookup times, times to deliver events to clients (asts, basts, > etc) for starters. How long does recovery take after a node crash? How does > all of this scale as you increase the number of nodes in your cluster? Well, frankly, recovery time of the DLM mostly will depend on the speed of the membership algorithm and timings used. My gut feeling is that DLM recovery time is small compared to membership event detection and the necessary fencing operation. But yes, scalability, at least roughly O(foo) guesstimates, for numbers of locks and/or number of nodes would be helpful, both for a) speed, but also b) number of network messages involved, for recovery and lock acquisition. Mark, do you have the data you ask for for OCFS2's DLM? (BTW, trimming quotes is considered polite on LKML.) Sincerely, Lars Marowsky-Br?e -- High Availability & Clustering SUSE Labs, Research and Development SUSE LINUX Products GmbH - A Novell Business - 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/