Date: Tue, 2 Dec 1997 18:43:01 +1100 From: Greg Lehey <grog@lemis.com> To: "Jamil J. Weatherbee" <jamil@trojanhorse.ml.org> Cc: Ian Freislich <iang@digs.iafrica.com>, Satoshi Asami <asami@cs.berkeley.edu>, hackers@FreeBSD.ORG Subject: Re: Drive Mirroring Message-ID: <19971202184301.28646@lemis.com> In-Reply-To: <Pine.BSF.3.96.971201210301.194A-100000@trojanhorse.ml.org>; from Jamil J. Weatherbee on Mon, Dec 01, 1997 at 09:05:47PM -0800 References: <E0xccrm-0004EW-00@brane.digs.iafrica.com> <Pine.BSF.3.96.971201210301.194A-100000@trojanhorse.ml.org>
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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
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