From: Jim C. Nasby <jnasby@pervasive.com>
To: Csaba Nagy <nagy@ecircle-ag.com>
To: Mikael Carneholm <Mikael.Carneholm@WirelessCar.com>
To: postgres performance list <pgsql-performance@postgresql.org>
Subject: Re: Migration study, step 1: bulk write performance
Date: Tue, 21 Mar 2006 06:01:58 -0600
Message-ID: <20060321120158.GO15742@pervasive.com> (raw)
In-Reply-To: <20060321115618.GA12880@uio.no>
References: <7F10D26ECFA1FB458B89C5B4B0D72C2B088286@sesrv12.wirelesscar.com>
<1142867952.16487.96.camel@coppola.muc.ecircle.de>
<20060321112759.GF15742@pervasive.com>
<1142941966.23597.4.camel@coppola.muc.ecircle.de>
<20060321115618.GA12880@uio.no>
On Tue, Mar 21, 2006 at 12:56:18PM +0100, Steinar H. Gunderson wrote:
> On Tue, Mar 21, 2006 at 12:52:46PM +0100, Csaba Nagy wrote:
> > They knew however that for the data partitions no FS journaling is
> > needed, and for the WAL partition meta data journaling is enough, so I
> > guess they tuned ext3 for this.
>
> For the record, that's the wrong way round. For the data partitioning
> metadata journaling is enough, and for the WAL partition you don't need any
> FS journaling at all.
Are you sure? Metadate changes are probably a lot more common on the WAL
partition. In any case, I don't see why there should be a difference.
The real issue is: is related filesystem metadata sync'd as part of a
file being fsync'd?
--
Jim C. Nasby, Sr. Engineering Consultant jnasby@pervasive.com
Pervasive Software http://pervasive.com work: 512-231-6117
vcard: http://jim.nasby.net/pervasive.vcf cell: 512-569-9461
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To: pgsql-performance@postgresql.org
Cc: jnasby@pervasive.com, nagy@ecircle-ag.com, Mikael.Carneholm@WirelessCar.com
Subject: Re: Migration study, step 1: bulk write performance
In-Reply-To: <20060321120158.GO15742@pervasive.com>
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