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Date: Thu, 12 Jul 2012 11:53:40 -0600 (MDT)
From: Warren Block <wblock@wonkity.com>
To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>
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Cc: Kaya Saman <kayasaman@gmail.com>, miles kuo <miles.kuo@gmail.com>,
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Subject: Re: How to mirror the FreeBSD OS on two disks
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On Thu, 12 Jul 2012, Wojciech Puchar wrote:

>> 
>> The current Handbook procedure avoids the copy by using the existing disk 
>> as-is and just writing the gmirror metadata to the last block.
> Exactly what i do doing instalations manually!
>
>> If that last block is already part of an MBR partition, the more strict 
>> checking stops booting in 9.0.
>
> not making MBR partition would not make problems.

There's no guarantee that bsdlabel checking won't be made more strict. 
No matter what type of partitioning scheme, the metadata should not be
inside the data area.