From: Craig Ringer <craig@2ndQuadrant.com>
To: Niels Kristian Schjødt <nielskristian@autouncle.com>
Cc: Jeff Janes <jeff.janes@gmail.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Do I have a hardware or a software problem?
Date: Tue, 11 Dec 2012 21:29:00 +0800
Message-ID: <50C7351C.30407@2ndQuadrant.com> (raw)
In-Reply-To: <8F7661E7-D6D4-4334-8C6A-A8B6C56A2C3F@autouncle.com>
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On 12/11/2012 06:04 PM, Niels Kristian Schjødt wrote:
>
> Maybe I should mention, that I never see more than max 5Gb out of my total 32Gb being in use on the server… Can I somehow utilize more of it?
For an update-mostly workload it probably won't do you tons of good so
long as all your indexes fit in RAM. You're clearly severely
bottlenecked on disk I/O not RAM.
> The SSD's I use a are 240Gb each which will grow too small within a
> few months - so - how does moving the whole data dir onto four of
> those in a RAID5 array sound?
Not RAID 5!
Use a RAID10 of four or six SSDs.
--
Craig Ringer http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Training & Services
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To: pgsql-performance@postgresql.org
Cc: craig@2ndQuadrant.com, nielskristian@autouncle.com, jeff.janes@gmail.com
Subject: Re: Do I have a hardware or a software problem?
In-Reply-To: <50C7351C.30407@2ndQuadrant.com>
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