linux-ext4 - Re: default ext3 journal mode - time to poke at this again?

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Message-ID: <4A64C48C.8000504@redhat.com>
Date:	Mon, 20 Jul 2009 15:25:00 -0400
From:	Ric Wheeler <rwheeler@...hat.com>
To:	Jan Kara <jack@...e.cz>
CC:	linux-ext4@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	"Stephen C. Tweedie" <sct@...hat.com>,
	Theodore Tso <tytso@....edu>, Andreas Dilger <adilger@....com>,
	Eric Sandeen <esandeen@...hat.com>,
	Christoph Hellwig <hch@...radead.org>
Subject: Re: default ext3 journal mode - time to poke at this again?

On 07/20/2009 02:57 PM, Jan Kara wrote:
>    Hi,
>
>    
>> At the linux symposium this week, some of us were wondering when it
>> would be safe to try and default ext3's default journal mode back to
>> sanity given that all (?) distros immediately reverted the default to
>> data writeback mode.
>>      
>    Well, at least SUSE still uses data=ordered,barrier as a default (and
> I personally think this is the right thing to do). Hmm, maybe you've
> meant this and just wrote it otherwise given your paragraph below ;)
>    

Definitely what I meant to post - Fedora and RHEL both use ordered mode 
as a default as well. Not many fs developers are fans of data writeback 
mode as far as I can tell...

>    
>> Failing that, can we at least clean up the config option description to
>> properly give the normal users a non-bogus, technical description of the
>> trade off ?
>>      
>    Yes, I'm all for it. Will you try to write up something or should I?
>
> 									Honza
>    

I posted something (from rwheeler@...hat.com) earlier today and we had a 
discussion about this on the ext4 call. I think that Ted will try to 
update the text that I proposed over the next couple of days.

I think that Chris will be reposting his data guarded mode patches soon 
as well, so we might be able to move forward quickly :-)

ric


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