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From: Michael Stone <mstone+postgres@mathom.us>
To: Jim C. Nasby <jnasby@pervasive.com>
Cc: mark@mark.mielke.cc
Cc: pgsql-performance@postgresql.org
Subject: Re: Postgresql Performance on an HP DL385 and
Date: Tue, 15 Aug 2006 16:53:03 -0400
Message-ID: <20060815205300.GX2900@mathom.us> (raw)
In-Reply-To: <20060815191505.GH21363@pervasive.com>
References: <20060810110935.GF2900@mathom.us>
	<20060814153841.GF27928@pervasive.com>
	<721b21dc0608140851v2332cdf9g59808004c983540f@mail.gmail.com>
	<20060814170545.GG27928@pervasive.com>
	<20060814170902.GN2900@mathom.us>
	<20060815162926.GS27928@pervasive.com>
	<20060815172645.GU2900@mathom.us>
	<20060815183327.GC12834@mark.mielke.cc>
	<20060815190254.GW2900@mathom.us>
	<20060815191505.GH21363@pervasive.com>

On Tue, Aug 15, 2006 at 02:15:05PM -0500, Jim C. Nasby wrote:
>Now, if
>fsync'ing a file also ensures that all the metadata is written, then
>we're probably fine... 

...and it does. Unclean shutdowns cause problems in general because 
filesystems operate asynchronously. postgres (and other similar 
programs) go to great lengths to make sure that critical operations are 
performed synchronously. If the program *doesn't* do that, metadata 
journaling isn't a magic wand which will guarantee data integrity--it 
won't.  If the program *does* do that, all the metadata journaling adds 
is the ability to skip fsck and start up faster.

Mike Stone

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