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Date:      Tue, 25 Jul 2000 12:51:01 -0700 (PDT)
From:      Matthew Jacob <mjacob@feral.com>
To:        Poul-Henning Kamp <phk@critter.freebsd.dk>
Cc:        freebsd-arch@FreeBSD.ORG
Subject:   Re: How much do we need the all-singing, all-dancing devfs? 
Message-ID:  <Pine.BSF.4.10.10007251246140.56819-100000@beppo.feral.com>
In-Reply-To: <13763.964554142@critter.freebsd.dk>

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> In my mind it would make more sense to make an API to examine the
> disklabels (of various sorts) and pick the "FreeBSD device identifier"
> from there.
> 
> That way all devices, SCSI, ATA, IDE, RAID, Flash and so on can be
> handled.

For devices that have been so labelled, yes, and that the label in question
can be written to the device media (or stored in the device). This means that
you have an import step. Not the worst thing in the world, but it does indeed
restrict usage and sharing on a SAN- you can't rewrite the 50 NT volume labels
on the SAN to find a FreeBSD identifier. And ocmpanies won't use FreeBSD if
that is what we will require (this, I in fact, *do* know from stuff at
Veritas- ask me some time what hacks that have to happen to make sure, when
exporting volumes in target mode, you have to take to make sure that NT
doesn't emit it's love label all over your FreeBSD volumes!).

As I've said- I would like to have what you propose available. I would prefer
it. But I also would like to solve directly addressing via immutable hardware
properties (which vary as to type from device to device) direct access to some
devices.

-matt




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