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Re: We really ought to do something about O_DIRECT and data=journalled on ext4

From: Andres Freund <andres(at)anarazel(dot)de>
To: pgsql-hackers(at)postgresql(dot)org
Cc: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>, Josh Berkus <josh(at)agliodbs(dot)com>
Subject: Re: We really ought to do something about O_DIRECT and data=journalled on ext4
Date: 2010-12-01 18:41:46
Message-ID: 201012011941.46965.andres@anarazel.de (view raw or flat)
Thread:
Lists: pgsql-hackers
On Wednesday 01 December 2010 19:09:05 Tom Lane wrote:
> Josh Berkus <josh(at)agliodbs(dot)com> writes:
> > It's a bug and it's our bug.
> 
> No, it's a filesystem bug that this particular filesystem doesn't
> support a perfectly reasonable combination of options, and doesn't
> even fail gracefully as it could easily do.  But assigning blame
> doesn't help much.
I wouldnt call it a reasonable combination - promising fs-level data-
journaling (data=journal) and O_DIRECT are not really compatible with each 
other...

Andres


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