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Date:      Tue, 7 Jul 2009 15:36:35 -0400
From:      "illoai@gmail.com" <illoai@gmail.com>
To:        Daniel Underwood <djuatdelta@gmail.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: 2 questions: GEOM_LABEL and partition naming
Message-ID:  <d7195cff0907071236qe23027ehdf64d2ec6edb0eaa@mail.gmail.com>
In-Reply-To: <b6c05a470907070541y6655fc5fxb9a31a76178af7a3@mail.gmail.com>
References:  <b6c05a470907070541y6655fc5fxb9a31a76178af7a3@mail.gmail.com>

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2009/7/7 Daniel Underwood <djuatdelta@gmail.com>:
> Good morning, folks! =A0(At least, it's morning on the east coast of USA)
>
>
> QUESTION 1: Would someone please explain the /var/run/dmesg.boot excerpt =
below?
>
> Note: I have glanced at both of the following links, but at the
> moment, I do not have time to dig into the documentation and learn all
> about this. =A0I'm hoping to get enough knowledge to understand what's
> going on with this excerpt, and then later invest time in deeper
> learning.
> <http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/geom.html>;
> <http://www.freebsd.org/cgi/man.cgi?query=3Dgeom&sektion=3D4>;
>
> [BEGIN excerpt from dmesg.boot]
> GEOM_LABEL: Label for provider ad0s1a is ufsid/4a0047d615cb402f.
> GEOM_LABEL: Label for provider ad0s1d is ufsid/4a0047d94598831f.
> GEOM_LABEL: Label for provider ad0s1e is ufsid/4a0047d8017e2a4d.
> GEOM_LABEL: Label for provider ad0s1f is ufsid/4a0047d82cde044f.
> GEOM_LABEL: Label for provider ad0s1g is ufsid/4a0047d6b40e9fa1.
> Trying to mount root from ufs:/dev/ad0s1a
> GEOM_LABEL: Label ufsid/4a0047d615cb402f removed.
> GEOM_LABEL: Label for provider ad0s1a is ufsid/4a0047d615cb402f.
> GEOM_LABEL: Label ufsid/4a0047d6b40e9fa1 removed.
> GEOM_LABEL: Label for provider ad0s1g is ufsid/4a0047d6b40e9fa1.
> GEOM_LABEL: Label ufsid/4a0047d8017e2a4d removed.
> GEOM_LABEL: Label for provider ad0s1e is ufsid/4a0047d8017e2a4d.
> GEOM_LABEL: Label ufsid/4a0047d82cde044f removed.
> GEOM_LABEL: Label for provider ad0s1f is ufsid/4a0047d82cde044f.
> GEOM_LABEL: Label ufsid/4a0047d94598831f removed.
> GEOM_LABEL: Label for provider ad0s1d is ufsid/4a0047d94598831f.
> GEOM_LABEL: Label ufsid/4a0047d615cb402f removed.
> GEOM_LABEL: Label ufsid/4a0047d6b40e9fa1 removed.
> GEOM_LABEL: Label ufsid/4a0047d8017e2a4d removed.
> GEOM_LABEL: Label ufsid/4a0047d82cde044f removed.
> GEOM_LABEL: Label ufsid/4a0047d94598831f removed.
> [END excerpt from dmesg.boot]

By default now, geom creates an ufsid label on its
ufs partitions (similar idea to linux's uuid scheme).

If you choose to not use it (let us say, for instance,
as we can clearly see, as no-one could disagree (and
30 other inane Chomskyisms)) by mounting your partitions
via their respective bsdlabel names, geom kindly removes
them.  There has been some debate as to whether this should
be silent or not (I think in freebsd-current@), since it is perfectly
safe to ignore.

It is perfectly safe to ignore.



--=20
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