Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S262508AbVCJKbE (ORCPT ); Thu, 10 Mar 2005 05:31:04 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S262507AbVCJKbE (ORCPT ); Thu, 10 Mar 2005 05:31:04 -0500 Received: from gate.in-addr.de ([212.8.193.158]:59881 "EHLO mx.in-addr.de") by vger.kernel.org with ESMTP id S262510AbVCJK2Y (ORCPT ); Thu, 10 Mar 2005 05:28:24 -0500 Date: Thu, 10 Mar 2005 11:27:26 +0100 From: Lars Marowsky-Bree To: Alex Aizman Cc: Matt Mackall , linux-scsi@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [ANNOUNCE 0/6] Open-iSCSI High-Performance Initiator for Linux Message-ID: <20050310102726.GT4105@marowsky-bree.de> References: <422BFCB2.6080309@yahoo.com> <20050309050434.GT3163@waste.org> <422E8EEB.7090209@yahoo.com> <20050309060544.GW3120@waste.org> <422E96D9.6090202@yahoo.com> <20050309222114.GF4105@marowsky-bree.de> <422FB2B5.3070803@yahoo.com> Mime-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: 8bit In-Reply-To: <422FB2B5.3070803@yahoo.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: 1473 Lines: 37 On 2005-03-09T18:36:37, Alex Aizman wrote: > Heartbeat is good for reliability, etc. WRT "getting paged-out" - > non-deterministic (things depend on time), right? Right, if we didn't get scheduled often enough for us to send our heartbeat messages to the other peers, they'll evict us from the cluster and fence us, causing a service disruption. With all these protections in place though, we can run at roughly 50ms heartbeat intervals from user-space, reliably, which allows us a node dead timer of ~200ms. I think that's pretty damn good. (Of course, realistically, even for subsecond fail-over, 200ms keep alives are sufficient, and 50ms would be quite extreme. But, it works.) > >That works well in our current development series, and if you want to > >share code, you can either rip it off (Open Source, we love ya ;) or we > >can spin off these parts into a sub-package for you to depend on... > If it's not a big deal :-) let's do the "sub-package" option. I've brought this up on the linux-ha-dev list. When do you need this? 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/