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Date: Wed, 10 Jun 2009 12:25:04 +0300
From: Manolis Kiagias <sonicy@otenet.gr>
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To: Valentin Bud <valentin.bud@gmail.com>
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Cc: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl>,
	freebsd-questions <freebsd-questions@freebsd.org>
Subject: Re: glabel(8) a gmirror(8) doesn't work
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Valentin Bud wrote:
> On Wed, Jun 10, 2009 at 9:58 AM, Wojciech Puchar <
> wojtek@wojtek.tensor.gdynia.pl> wrote:
>
>   
>>  following
>>     
>>> procedure:
>>> 1. reboot to single user
>>> 2. mount -a
>>> 3. tunefs -L var /dev/mirror/system0s1d
>>> This commands exits with "Failed to write superblock".
>>>
>>>       
>> replace mount -a with mount /
>>
>> you can't write directly to partition which is mounted mounted
>>
>>     
>
> Thanks this time it worked. I am almost sure (99%) I've tried that already
> yesterday but the 1% wins.
>
> One more question can i label the / partition. I have the same error when i
> try
> to label it.
>
> v
>   

You should be able to. Just reboot into single user mode and *do not*
enter any mount commands.  The / partition is mounted read only in this
case, and tunefs -L will succeed.