Message-ID: <50C7351C.30407@2ndQuadrant.com>
Date: Tue, 11 Dec 2012 21:29:00 +0800
From: Craig Ringer <craig@2ndQuadrant.com>
Organization: 2nd Quadrant
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To: =?windows-1252?Q?Niels_Kristian_Schj=F8dt?= <nielskristian@autouncle.com>
CC: Jeff Janes <jeff.janes@gmail.com>,
	"pgsql-performance@postgresql.org" <pgsql-performance@postgresql.org>
Subject: Re: Do I have a hardware or a software problem?
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	<CAMkU=1zcXD5YWMD=QOAdoNG0BKoB-DAXKbzBKybE-3w-YzhSgw@mail.gmail.com>
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On 12/11/2012 06:04 PM, Niels Kristian Schj=F8dt wrote:
>
> Maybe I should mention, that I never see more than max 5Gb out of my tota=
l 32Gb being in use on the server=85 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?=20

Not RAID 5!

Use a RAID10 of four or six SSDs.

--=20
 Craig Ringer                   http://www.2ndQuadrant.com/
 PostgreSQL Development, 24x7 Support, Training & Services


--=20
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