| From: | Craig Ringer <craig(at)2ndQuadrant(dot)com> |
|---|---|
| To: | Niels Kristian Schjødt <nielskristian(at)autouncle(dot)com> |
| Cc: | Jeff Janes <jeff(dot)janes(at)gmail(dot)com>, "pgsql-performance(at)postgresql(dot)org" <pgsql-performance(at)postgresql(dot)org> |
| Subject: | Re: Do I have a hardware or a software problem? |
| Date: | 2012-12-11 13:29:00 |
| Message-ID: | 50C7351C.30407@2ndQuadrant.com |
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| Lists: | pgsql-performance |
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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