From owner-freebsd-geom@FreeBSD.ORG  Wed Feb  7 21:50:15 2007
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From: Marcel Moolenaar <xcllnt@mac.com>
Date: Wed, 7 Feb 2007 13:32:13 -0800
To: Ivan Voras <ivoras@fer.hr>
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Cc: freebsd-geom@freebsd.org
Subject: Re: New g_part class
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On Feb 7, 2007, at 1:16 PM, Ivan Voras wrote:

> Ok, the need for sysctl kern.geom.debugflags=16 arises because the  
> live
> system to be used as master has mounted partitions, and those  
> partitions
> span the whole disk, thus conflict with gmirror which wants to use the
> last sector. Since using the last sector for metadata is The Official
> Way, how about making such conflicts easy to avoid, like for example
> building additional logic in g_part to create partitions one sector
> smaller than the container?

This cannot generally be done. The GPT partition scheme puts a backup
of the header sector in the very last sector on disk, as per the specs.

-- 
Marcel Moolenaar
xcllnt@mac.com