From owner-freebsd-cluster Wed Mar 6 7:52: 4 2002 Delivered-To: freebsd-cluster@freebsd.org Received: from acl.lanl.gov (acl.lanl.gov [128.165.147.1]) by hub.freebsd.org (Postfix) with SMTP id 3FAAB37B405 for ; Wed, 6 Mar 2002 07:52:02 -0800 (PST) Received: (qmail 222646 invoked from network); 6 Mar 2002 08:52:00 -0700 Received: from snaresland.acl.lanl.gov (128.165.147.113) by acl.lanl.gov with SMTP; 6 Mar 2002 08:52:00 -0700 Received: (qmail 8167 invoked by uid 3499); 6 Mar 2002 08:52:00 -0700 Received: from localhost (sendmail-bs@127.0.0.1) by localhost with SMTP; 6 Mar 2002 08:52:00 -0700 Date: Wed, 6 Mar 2002 08:52:00 -0700 (MST) From: Ronald G Minnich X-X-Sender: To: Andy Sporner Cc: Jason Fried , Subject: RE: FreeBSD Cluster at SLU In-Reply-To: Message-ID: MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII Sender: owner-freebsd-cluster@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG On Wed, 6 Mar 2002, Andy Sporner wrote: > Within reason I agree... However having things in one place defeats > the high availabilty on a cluster, but we may be talking about > different things here. no, this is actually funny thinking about uptime. People frequently confuse things. - A system with Multiple Points of Failure (MPOF) has no Single Point of Failure (SPOF) - A system with a Single Point of Failure (SPOF) - A system with No SPOF Often, people build systems with MPOF, and mistakenly think they have achieved a sytem with No SPOF. Wrong. We're just trying to get to a system with SPOF, harder than it looks. > I am looking at making Unix machines more > reliable to get to 99.999% uptime. You can actually do this with one node. It's doing it with lots of nodes that is hard. > If your configuration image is on > machine, than you have no backups. See above. > The cluster approach I designed > has replication of configuration that covers this, so your "Cluster > Monitor" node can fail-over when that machine fails (should it...). How large have you made your system to date? how many nodes? have you built it? ron To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-cluster" in the body of the message