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Re: Comparing XFS with ext3 and ReiserFS

To: linux-xfs@xxxxxxxxxxx
Subject: Re: Comparing XFS with ext3 and ReiserFS
From: patl@xxxxxxxxxxxxxxx (Patrick J. LoPresti)
Date: 06 May 2001 11:27:11 -0400
In-reply-to: <mit.lcs.mail.linux-xfs/20010506105300.84C50125E6@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
References: <Pine.LNX.4.21.0105061818500.10780-100000@xxxxxxxxxxxxxxxxxxx> <20010506105300.84C50125E6@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Sender: owner-linux-xfs@xxxxxxxxxxx
User-agent: Gnus/5.0808 (Gnus v5.8.8) Emacs/20.7
Keith Matthews <keith_m@xxxxxxxxxxxxxxxxxxx> writes:

> The other difference from what I have read is that ext3 allows journalling
> of the file content data as well as the metadata, the other three (as far
> as I can see) only journal metadata. This may be important to you.

I apologize if this is a stupid question, but how could data
journalling possibly matter to anybody?

I mean, as long as the data are written to disk before the metadata
are written to the journal, there is no reliability to be gained by
journalling the data.  What am I missing?

Along the same lines: Somebody else said that they power-cycled their
XFS system, ended up with garbage in one of their files, but says this
is "not a bug".  Excuse me?  How could a corrupted file not be a bug?

Perhaps what I am really asking is: Does XFS write the data to disk
before the metadata, or not?

Thanks!

 - Pat

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