Date: Fri, 28 Jul 2000 18:13:13 +0200 From: Wilko Bulte <wkb@freebie.demon.nl> To: Matthew Jacob <mjacob@feral.com> Cc: wilko@freebsd.org, Adrian Chadd <adrian@freebsd.org>, freebsd-arch@freebsd.org Subject: Re: How much do we need the all-singing, all-dancing devfs? Message-ID: <20000728181312.A6724@freebie.demon.nl> In-Reply-To: <Pine.BSF.4.10.10007280630440.60544-100000@beppo.feral.com>; from mjacob@feral.com on Fri, Jul 28, 2000 at 06:33:38AM -0700 References: <20000728110827.A3470@freebie.demon.nl> <Pine.BSF.4.10.10007280630440.60544-100000@beppo.feral.com>
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On Fri, Jul 28, 2000 at 06:33:38AM -0700, Matthew Jacob wrote:
>
> > > No- I want to map a *device*- I don't *particularly* care what it's name is
> > > (the thing put in /etc/fstab or handed to 'mt')- but I do not necessarily want
> > > to have to write to it (for a label) to address it. I can guarantee that the
> >
> > After all this is not NT ('it is harmless to write a signature').
>
> No, no, no. Some folks are serious about you can't do this in their SAN. Also,
> what about read-only devices?
Sorry, I should have put a ;-) after that line. I've seen it happen too
often that NT scribbles it's darned signature on LUNs hanging off a fabric.
OK, the RAIDboxes had not been setup correctly to only allow the right
machines (so excluding the NT ones) access, but still. Writing is evil here.
> > Can you? Assuming a LIP on a FC-AL that is setup for soft addressing and
> > where devices come/go.
>
> Look at isp_pdb_sync in isp.c, around line ~1609- I mean that I can guarantee
> that with respect to the system, while it is running, the 'target' won't
> change. The loopids can wander all over the map...
OK, makes sense now. Bottom line is you trace them on the only thing
guaranteed to be unique: the WWN. If someone is interested in knowing what
happens when a duplicate WWN is present on a single fabric: it is
entertaining.. Once had to figure out what happens.
--
Wilko Bulte wilko@freebsd.org
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