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Date: Thu, 12 Jul 2012 13:47:59 -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>,
	freebsd-questions@freebsd.org
Subject: Re: How to mirror the FreeBSD OS on two disks
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On Thu, 12 Jul 2012, Wojciech Puchar wrote:

>> last partition includes the block of gmirror metadata, that's an error.
>
> no it doesn't

You appear to be agreeing with me, but saying that your method does not 
produce that problem.

> i do this 2 ways:
>
> method 1) i FIRST do gmirror on whole disk
>
> THEN partition it, so partition sizes sums up to gmirror size which is 1 
> sector less disk size.
>
> then bsdlabel -B
>
> method 2) i make same disklabel on both disk, then bsdlabel -B, them gmirror 
> each partitions separately.
> often i do not mirror all partitions, ew. i do not for squid proxy data if 
> used.
>
>
> both method results in system bootable from both drives and proper 
> disklabels.

Yes, these are the same methods that can be used with MBR partitions. 
The second works with GPT partitioning also.