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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>
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
Message-ID:  <alpine.BSF.2.00.1207121343450.47013@wonkity.com>
In-Reply-To: <alpine.BSF.2.00.1207122105350.3122@wojtek.tensor.gdynia.pl>
References:  <CAGpP9XOvVor7HmxDP7SFhc7AFnpSf-s%2BgXbkJsguiAo=xNvnVA@mail.gmail.com> <CAPj0R5L1=HaY1Bf-51FB59J6Q4pX1s4yDbzXoAAWRwei6yqt-A@mail.gmail.com> <alpine.BSF.2.00.1207110702490.76348@wonkity.com> <alpine.BSF.2.00.1207121649080.2235@wojtek.tensor.gdynia.pl> <alpine.BSF.2.00.1207121004560.47013@wonkity.com> <alpine.BSF.2.00.1207121941370.2744@wojtek.tensor.gdynia.pl> <alpine.BSF.2.00.1207121147350.47013@wonkity.com> <alpine.BSF.2.00.1207122037020.2852@wojtek.tensor.gdynia.pl> <alpine.BSF.2.00.1207121253040.47013@wonkity.com> <alpine.BSF.2.00.1207122105350.3122@wojtek.tensor.gdynia.pl>

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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.



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