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Date: Sat, 24 Apr 2010 20:17:07 -0700
From: Matthew Jacob <mj@feral.com>
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To: Jeff Roberson <jroberson@jroberson.net>
References: r2x7d6fde3d1004210606o25fdf542j42cb5fdef75991e2@mail.gmail.com	<4BD35437.2060208@lissyara.su>
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Cc: Alex Keda <admin@lissyara.su>, freebsd-current@freebsd.org
Subject: Re: HEADS UP: SUJ Going in to head today
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Jeff Roberson wrote:
> On Sun, 25 Apr 2010, Alex Keda wrote:
>
>> try in single user mode:
>>
>> tunefs -j enable /
>> tunefs: Insuffient free space for the journal
>> tunefs: soft updates journaling can not be enabled
>>
>> tunefs -j enable /dev/ad0s2a
>> tunefs: Insuffient free space for the journal
>> tunefs: soft updates journaling can not be enabled
>> tunefs: /dev/ad0s2a: failed to write superblock
>
> There is a bug that prevents enabling journaling on a mounted 
> filesystem. So for now you can't enable it on /.  I see that you have 
> a large / volume but in general I would also suggest people not enable 
> suj on / anyway as it's typically not very large.  I only run it on my 
> /usr and /home filesystems.
>
> I will send a mail out when I figure out why tunefs can't enable suj 
> on / while it is mounted read-only.
>
> Thanks,
> Jeff

One of the attractions for suj would be for appliancized FreeBSD which 
now has to set 'fsck -y' for power fail/resets- and this means root as well.