Message-ID: <44021D2D.20105@vilain.net>
Date: Mon, 27 Feb 2006 10:27:09 +1300
From: Sam Vilain <sam@vilain.net>
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To: "Theodore Ts'o" <tytso@mit.edu>
Cc: Xin Zhao <uszhaoxin@gmail.com>, Arjan van de Ven <arjan@infradead.org>,
       linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org
Subject: Re: question about possibility of data loss in Ext2/3 file system
References: <4ae3c140602221356x15015171h5aa4a3d7bb6034e0@mail.gmail.com> <1140645651.2979.79.camel@laptopd505.fenrus.org> <4ae3c140602221434v6ec583a7yf04df5fa7a4948fc@mail.gmail.com> <20060223045836.GC9645@thunk.org> <43FE1110.1030707@vilain.net> <20060224162957.GA22097@thunk.org>
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Theodore Ts'o wrote:
>>I always liked Sun's approach to this in Online Disk Suite - journal at 
>>the block device level rather than the FS / application level. 
>>Something I haven't seen from the Linux md-utils or DM.
> You can do data block journalling in ext3.  But the performance impact
> can be significant for some work loads.   TNSFAAFL.

Sure, but on a large system with a big array, you just move the journal 
to a seperate diskset.  That can make a big speed improvement for those 
types of update patterns where you care about always applying updates 
sequentially, such as a filesystem or a database.

Sam.
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