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Date:      Fri, 14 Sep 2012 22:24:19 -0700
From:      Yuri <yuri@rawbw.com>
To:        Warren Block <wblock@wonkity.com>
Cc:        freebsd-hackers@freebsd.org
Subject:   Re: Why fdisk can't open root disk with MBR for writing?
Message-ID:  <50541103.6050608@rawbw.com>
In-Reply-To: <alpine.BSF.2.00.1209142016200.36584@wonkity.com>
References:  <5053C9A1.3030605@rawbw.com> <alpine.BSF.2.00.1209142016200.36584@wonkity.com>

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On 09/14/2012 19:23, Warren Block wrote:
> Did you actually try gpart?  GEOM prevents writes to providers that 
> are in use, but gpart should handle it correctly if the problem is 
> just that fdisk doesn't understand GEOM.
>
> # gpart set -a active -i 1 ada0
>
> If that fails, the provider is in use, usually mounted.  The safety 
> can be disabled, but it's better to figure out what has it in use. 

Yes it is the hard drive with mounted /. But changing the active slice 
should be safe in any case.
gpart worked.
This safety feature is protecting people from themselves. Sounds very 
familiar.

Thanks!
Yuri



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