From: Andrew Sullivan <ajs@commandprompt.com>
To: pgsql-performance@postgresql.org
Subject: Re: Choosing a filesystem
Date: Thu, 11 Sep 2008 13:07:26 -0400
Message-ID: <20080911170725.GL1008@commandprompt.com> (raw)
In-Reply-To: <48C94770.2090505@shopzeus.com>
References: <48C94770.2090505@shopzeus.com>
On Thu, Sep 11, 2008 at 06:29:36PM +0200, Laszlo Nagy wrote:
> The expert told me to use RAID 5 but I'm hesitating. I think that RAID 1+0
> would be much faster, and I/O performance is what I really need.
I think you're right. I think it's a big mistake to use RAID 5 in a
database server where you're hoping for reasonable write performance.
In theory RAID 5 ought to be fast for reads, but I've never seen it
work that way.
> I would like to put the WAL file on the SAS disks to improve performance,
> and create one big RAID 1+0 disk for the data directory. But maybe I'm
> completely wrong. Can you please advise how to create logical partitions?
I would listen to yourself before you listen to the expert. You sound
right to me :)
A
--
Andrew Sullivan
ajs@commandprompt.com
+1 503 667 4564 x104
http://www.commandprompt.com/
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To: pgsql-performance@postgresql.org
Cc: ajs@commandprompt.com
Subject: Re: Choosing a filesystem
In-Reply-To: <20080911170725.GL1008@commandprompt.com>
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