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Date: Sun, 21 Oct 2012 08:32:49 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: "Lucas B. Cohen" <lbc@bnrlabs.com>
Subject: Re: 9.1 and gmirror with GPT?
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On Sun, 21 Oct 2012, Lucas B. Cohen wrote:

> On 2012.10.20 20:17, freebsd@johnea.net wrote:
>> Just wondering if 9.1 will bring any improvement to the situation of creating a full disk geom mirror while also using GPT partition table?
>
> I'm curious about what this is about. Could you refer me to an article
> or a discussion where this issue is described ?

The GPT backup partition tables goes at the end of a disk, the same 
place gmirror(8) and other GEOM modules keep metadata.  If GPT 
partitions are created inside a mirror, the backup GPT table is no 
longer at the end of the disk.  Hiroki Sato created a patch which fixed 
the gptboot complaints, but there was concern about the nonstandard 
location of the backup table.

At present, MBR partitioning is recommended with gmirror(8).