From: Frank Wiles <frank@wiles.org>
To: Alexandre Barros <alexandre@vectorx.com.br>
Cc: pgsql-performance@postgresql.org
Subject: Re: performance drop on RAID5
Date: Wed, 24 Aug 2005 10:52:43 -0500
Message-ID: <20050824105243.067f0ae5.frank@wiles.org> (raw)
In-Reply-To: <430C8779.9080500@vectorx.com.br>
References: <430C8779.9080500@vectorx.com.br>
On Wed, 24 Aug 2005 11:43:05 -0300
Alexandre Barros <alexandre@vectorx.com.br> wrote:
> I've googled a little, and maybe the cluster size might be one
> problem, but despite that, the performance dropping when running on
> "server-class" hardware with RAID-5 SCSI-2 drives was way above my
> most delirious expectations... i need some help to figure out what is
> **so** wrong...
RAID-5 isn't great for databases in general. What would be better
would be to mirror the disks to redundancy or do RAID 1+0.
You could probably also increase your shared_buffers some, but
that alone most likely won't make up your speed difference.
---------------------------------
Frank Wiles <frank@wiles.org>
http://www.wiles.org
---------------------------------
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To: pgsql-performance@postgresql.org
Cc: frank@wiles.org, alexandre@vectorx.com.br
Subject: Re: performance drop on RAID5
In-Reply-To: <20050824105243.067f0ae5.frank@wiles.org>
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