Date: Mon, 17 May 1999 10:04:11 +0100 (BST) From: Doug Rabson <dfr@nlsystems.com> To: Matthew Jacob <mjacob@feral.com> Cc: Mike Smith <mike@smith.net.au>, alpha@freebsd.org Subject: Re: I dunno... is this a bug? Message-ID: <Pine.BSF.4.05.9905171002420.509-100000@herring.nlsystems.com> In-Reply-To: <Pine.BSF.4.05.9905161433270.54372-100000@semuta.feral.com>
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On Sun, 16 May 1999, Matthew Jacob wrote: > > > && i386 FreeBSD (for 'dangerously dedicated' disks) are no longer > > > compatible. > > > > > > Is this a bug or a feature? > > > > The Alpha may never have supported "dangerously dedicated" disks. You > > may mean "truly dedicated" disks. I don't know that they were ever > > compatible; the label seems to be at different locations on each > > platform. > > I guess- I really haven't looked at the details. All I know was that at > some point last week I was testing the following configuration (where e && > d had the disk split exactly in half): > > Alpha PC 164 Fibre Channel -> da2e > da2d <- Fibre Channel 2xPPro i86 > > > This was what I would call and acceptable shared bus... Some time in the > last week a change has happened that made both sides now not recognize > each other's disklabel. Too bad, if so. I suppose I could try an fdisk > type label and see what happens.. > > I guess my metapoint or metaquestion here is: a Disk Label is a Disk > Label. If there is some canonical form on disk that makes a disk usable, > modulo stupid endian foo in non 8 bit data in the label, then the labels > should be usable across all architectures, and hence provide shared > raw volumes at least (. or ? as to whether it's a metapoint/meta-assertion > or a metaquestion) > > (this, btw, is becoming a pretty common configuration with FC loops) I'm not sure why this worked before. The problem is that alpha puts the label at offset 64 (dictated by OSF1 and NetBSD) and i386 puts it at offset 512. We could update readdisklabel to look in both places I suppose. -- Doug Rabson Mail: dfr@nlsystems.com Nonlinear Systems Ltd. Phone: +44 181 442 9037 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-alpha" in the body of the message
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