From owner-freebsd-stable Fri Jan 3 14: 8:57 2003 Delivered-To: freebsd-stable@freebsd.org Received: from mx1.FreeBSD.org (mx1.freebsd.org [216.136.204.125]) by hub.freebsd.org (Postfix) with ESMTP id 6CA1B37B401 for ; Fri, 3 Jan 2003 14:08:56 -0800 (PST) Received: from HAL9000.homeunix.com (12-233-57-224.client.attbi.com [12.233.57.224]) by mx1.FreeBSD.org (Postfix) with ESMTP id EAC6043ED8 for ; Fri, 3 Jan 2003 14:08:55 -0800 (PST) (envelope-from dschultz@uclink.Berkeley.EDU) Received: from HAL9000.homeunix.com (localhost [127.0.0.1]) by HAL9000.homeunix.com (8.12.6/8.12.5) with ESMTP id h03M8jjU012642; Fri, 3 Jan 2003 14:08:46 -0800 (PST) (envelope-from dschultz@uclink.Berkeley.EDU) Received: (from das@localhost) by HAL9000.homeunix.com (8.12.6/8.12.5/Submit) id h03M8jAN012641; Fri, 3 Jan 2003 14:08:45 -0800 (PST) (envelope-from dschultz@uclink.Berkeley.EDU) Date: Fri, 3 Jan 2003 14:08:45 -0800 From: David Schultz To: Nimrod Mesika Cc: freebsd-stable@FreeBSD.ORG Subject: Re: FreeBSD Stability Message-ID: <20030103220845.GA12586@HAL9000.homeunix.com> Mail-Followup-To: Nimrod Mesika , freebsd-stable@FreeBSD.ORG References: <200212170023.gBH0Nvlu000764@beast.csl.sri.com> <20030103000232.GA52181@blazingdot.com> <20030103062708.GA426@laurel.tmseck.homedns.org> <20030103084232.GA3371@localhost.bsd.net.il> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20030103084232.GA3371@localhost.bsd.net.il> Sender: owner-freebsd-stable@FreeBSD.ORG Precedence: bulk List-ID: List-Archive: (Web Archive) List-Help: (List Instructions) List-Subscribe: List-Unsubscribe: X-Loop: FreeBSD.ORG Thus spake Nimrod Mesika : > Think about compute servers. Our CAD servers can run simulations and > other types of processes for ~40 hours. You definitely don't want to > interrupt a running system and it finding some idle time for service > gets really difficult. What you want is to be able to take a core image of a process and restart it later. I forget the names of the programs that allow you to do this. Perhaps someone else can say what you need to google for. > Would be nice if you could upgrade subsystems one at a time. This > way one could, for example, shutdown the network subsystem, load > the new version and restart it. Loadable modules allow you to do this, but not all components of the kernel can be reloaded, even in a microkernel-based system. Even doing it for the network would be painful beyond words. If you can't bear 2 minutes of downtime for a VERY rare security (or feature) update, you really need redundancy anyway. To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-stable" in the body of the message