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Date: Wed, 30 Jan 2013 08:22:19 -0700 (MST)
From: Warren Block <wblock@wonkity.com>
To: Artem Kuchin <matrix@itlegion.ru>
Subject: Re: Software raid VS hardware raid
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On Wed, 30 Jan 2013, Artem Kuchin wrote:

> 30.01.2013 18:06, Warren Block:
>>>> 
>>>> GPT partitions should work, just limit it to one mirrored partition per 
>>>> drive.
>>> 
>>> Please, clarify what you mean here.
>> 
>> If only one GPT partition on a drive is mirrored with another GPT partition 
>> on another drive, head contention never comes up.  There is only one 
>> mirror.
>> 
>> It does nearly eliminate the usefulness of GPT partitioning.
>> 
> Um... and how can i do that if i have a simple mirror with two drives and 
> want to mirror everything on them? As i understand i will have at least
> bootable, swap and ufs parttions on those drives, that is 3 partitions at 
> least.

If you want to use the same drive for booting, it's possible.  Create 
all three partitions on both drives manually.  Then mirror the 
freebsd-ufs partition only.  The contents of the freebsd-boot partition 
don't change often, and swap does not have to be mirrored.

Not that it's easy or convenient, but it's an option.