From owner-freebsd-hackers Mon Dec 1 23:54:16 1997 Return-Path: Received: (from root@localhost) by hub.freebsd.org (8.8.7/8.8.7) id XAA08933 for hackers-outgoing; Mon, 1 Dec 1997 23:54:16 -0800 (PST) (envelope-from owner-freebsd-hackers) Received: from Tandem.com (suntan.tandem.com [192.216.221.8]) by hub.freebsd.org (8.8.7/8.8.7) with ESMTP id XAA08928 for ; Mon, 1 Dec 1997 23:54:14 -0800 (PST) (envelope-from grog@lemis.com) Received: from papillon.lemis.com ([168.87.69.104]) by Tandem.com (8.8.8/2.0.1) with ESMTP id XAA11309; Mon, 1 Dec 1997 23:53:21 -0800 (PST) Received: (grog@localhost) by papillon.lemis.com (8.8.8/8.6.12) id PAA01358; Tue, 2 Dec 1997 15:43:03 +0800 (CST) Message-ID: <19971202184301.28646@lemis.com> Date: Tue, 2 Dec 1997 18:43:01 +1100 From: Greg Lehey To: "Jamil J. Weatherbee" Cc: Ian Freislich , Satoshi Asami , hackers@FreeBSD.ORG Subject: Re: Drive Mirroring References: Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii X-Mailer: Mutt 0.84e In-Reply-To: ; from Jamil J. Weatherbee on Mon, Dec 01, 1997 at 09:05:47PM -0800 Organisation: LEMIS, PO Box 460, Echunga SA 5153, Australia Phone: +61-8-8388-8286 Fax: +61-8-8388-8725 Mobile: +61-41-739-7062 WWW-Home-Page: http://www.lemis.com/~grog Sender: owner-freebsd-hackers@FreeBSD.ORG X-Loop: FreeBSD.org Precedence: bulk On Mon, Dec 01, 1997 at 09:05:47PM -0800, Jamil J. Weatherbee wrote: > >> "Jamil J. Weatherbee"... >>> One problem with this: If the system is rebooted with only one drive it >>> crashes, second you cannot do a out of the box install on ccded drives so >>> they are pretty useless tom me for anything but data. >>> >>> I actually tried the exact scenario you suggest. >> >> This doesn't really make sense to me. I know that you can't do an >> install onto a ccd (which is a source of irritation for me) but I >> have a number of servers at work which I have setup or helped setup >> that have all of their file systems mirrored except for /. >> >> I'll admit it's a little laborious to setup, but it can be done. >> I do a minimal install, create the ccds, copy stuff around and then >> install source and the rest of the stuff that I want. >> >> I'm unsure why you don't want to use ccd. > > The main problem has to do with the kind of people that need to be able to > make the system work when it crashes. We are not talking about unix > geniuses here it is just their web server and If a disk stops they want to > have it replaced later without stopping the system for 24 hours to get > someone knowledgeable out there to fix it. This is my main concern. And > in this respect it looks like rdist might work for me but there are still > some security issues I need to resolve + that rdist doesn't do continuous > updates like ccd. rdist isn't really replicated. ccd is, but the fact that it won't recover from a crash makes it all but useless. As you point out, without experienced personnel, if a disk dies you could spend longer reconfiguring than reading in a backup. This doesn't have to be that way, of course. My RAID solution will not crash if a component goes down. Greg