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Re: Xfs_repair and journalling -- EXT4 journal replay discussion

To: Stan Hoeppner <stan@xxxxxxxxxxxxxxxxx>
Subject: Re: Xfs_repair and journalling -- EXT4 journal replay discussion
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Sun, 31 Mar 2013 13:03:04 +1100
Cc: Eric Sandeen <sandeen@xxxxxxxxxxx>, Subranshu Patel <spatel.ml@xxxxxxxxx>, xfs@xxxxxxxxxxx
Delivered-to: xfs@xxxxxxxxxxx
In-reply-to: <51573461.8070006@xxxxxxxxxxxxxxxxx>
References: <CAEUQceh-Xcabr0KErxF6EAdafDDP1PY_AeHwgYB82QeUdyGp-g@xxxxxxxxxxxxxx> <5147E360.10605@xxxxxxxxxxx> <5148037B.5010706@xxxxxxxxxxxxxxxxx> <201303190924.29362.Martin@xxxxxxxxxxxx> <51483A7D.9050202@xxxxxxxxxxxxxxxxx> <5156DF72.1090703@xxxxxxxxxxxxxxxxx> <5157237A.40006@xxxxxxxxxxx> <51573461.8070006@xxxxxxxxxxxxxxxxx>
User-agent: Mutt/1.5.21 (2010-09-15)
On Sat, Mar 30, 2013 at 01:52:17PM -0500, Stan Hoeppner wrote:
> On 3/30/2013 12:40 PM, Eric Sandeen wrote:
> > On 3/30/13 7:49 AM, Stan Hoeppner wrote:
> >> Ok, so here's the skinny on the source of our confusion WRT how/when
> >> EXT4 replays journals, and it's rather interesting.  Ted Ts'o explained
> >> the following.
> > 
> > Where was this, out of curiosity?
> Private email exchange with Ted.  I thought it was best from an
> etiquette standpoint not to wholesale paste his two private emails to
> the XFS list, but to summarize.  Maybe it would be ok if I put it on my
> web server for a couple of days then remove it.
> http://www.hardwarefreak.com/ext4-journaling.txt

That again?  I'll just point to this post from Ted in 2004:


It's the same FUD about XFS journalling and power failures that Ted
has been claiming for the past 10+ years. It's been rebutted so many
times I can now do it in three words: volatile drive caches.


Dave Chinner

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