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Date:      Mon, 2 Dec 2013 11:31:22 +0100
From:      Julien Cigar <jcigar@ulb.ac.be>
To:        "Mike." <the.lists@mgm51.com>
Cc:        freebsd-questions@freebsd.org
Subject:   Re: gmirror, gpart and MBR vs GPT in the Handbook
Message-ID:  <20131202103122.GN66981@mordor.lan>
In-Reply-To: <201312011121580096.005D00FB@smtp.24cl.home>
References:  <201311301303210813.05DE187E@smtp.24cl.home> <alpine.BSF.2.00.1311301352140.99113@wonkity.com> <201312011121580096.005D00FB@smtp.24cl.home>

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If you want to use GPT with gmirror you may want to mirror each
partition instead of the whole disk.

For example on my box I have the following: https://dpaste.de/Rb3S

On Sun, Dec 01, 2013 at 11:21:58AM -0500, Mike. wrote:
> On 11/30/2013 at 2:17 PM Warren Block wrote:
> 
> |On Sat, 30 Nov 2013, Mike. wrote:
> |
> | [snip]
> |
> |> Is there a specific reason why MBR was used in the Handbook
> |> example for creating a mirror, instead of GPT?
> |
> |Yes, there was, see the last paragraph of the Metadata Issues 
> |subsection, 
> |http://www.freebsd.org/doc/en_US.ISO8859-1/books/handbook/geom-m
> irror.html#geom-mirror-metadata
> |
> |[snip]
>  =============
> 
> 
> A question about the wording of that paragraph.  The second
> sentence states:
> 
> "Because GPT partition schemes also store metadata at the end of
> the disk, mirroring full GPT disks with gmirror(8) is not
> recommended."
> 
> 
> The word "full" is ambiguous.  Is it to mean, "full" as in 'full
> of data', or "full" as in 'the entire disk'?
> 
> 
> Thanks.
> 
> 
> 
> 
> 
> 
> 
> 
> 
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