Date: Sat, 29 Nov 1997 10:46:36 -0800 (PST) From: Julian Elischer <julian@whistle.com> To: Greg Lehey <grog@lemis.com> Cc: Andrew Kenneth Milton <akm@mother.sneaker.net.au>, hackers@freebsd.org Subject: Re: Drive Mirroring Message-ID: <Pine.BSF.3.95.971129104310.8788D-100000@current1.whistle.com> In-Reply-To: <19971129174129.61865@lemis.com>
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booting off mirrored disks isn't too hard. booting off striped disks is a real problem and booting off mirrored floppies is a snap. (swap floppy, hit reset) :) I had a system where the root is a MFS in a partition marked with ID 164 and when it has booted it loads everything from partitions marked 165. (which COULD have been mirrored or even striped) On Sat, 29 Nov 1997, Greg Lehey wrote: > On Sat, Nov 29, 1997 at 05:38:57PM +1100, Andrew Kenneth Milton wrote: > >> -----[ Greg Lehey ]------------------------------ > >> Booting is a different matter. > > > > I agree, (although if you had a list of alternatives to boot from...) > > but, it's usually difficult to explain this to clueless suit type people > > who have expectations of what the software they just bought can do. > > That's fine. They don't need to understand the technical background. > They paid for a solution, now they want a solution. > > > I don't think many people would want to mirror their boot partition, since > > it's pretty static. > > Right, assuming (as is common in SysV) that they have a separate boot > partition, probably mounted on /stand. But the root file system is a > whole different kettle of fish. > > > The people from Periphonics wanted $25,000 (USD 1995) for a 1 gig > > scsi drive for the rack mounted Sun that sits in their IVR Box. Any > > other drives void the warranty. We decided it was cheaper to void > > the warranty. > > Yup, I'd understand that, especially when I consider how much the > warranty is probably worth. > > > The disk in the Sun is already pre-partitioned (one big one), and those that > > be wouldn't let me re-partition it sanely. Hence they wanted the whole > > disk mirrored, boot and all. > > Sounds like SNI. A minimum of 5 partitions on a 1 GB drive, and the > install utility is set up so that you just *can't* do without any of > them. > > Greg >
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