From: Cosimo Streppone <cosimo@streppone.it>
To: Postgresql Performance list <pgsql-performance@postgresql.org>
Subject: Looking for hw suggestions for high concurrency OLTP app
Date: Mon, 11 Dec 2006 17:26:49 +0100
Message-ID: <457D86C9.10103@streppone.it> (raw)
Hi all,
I'd like to get suggestions from all you out there for
a new Postgresql server that will replace an existing one.
My performance analysis shows very *low* iowaits,
and very high loads at times of peak system activity.
The average concurrent processes number is 3/4, with peaks of 10/15.
*Sustained* system load varies from 1.5 to 4, while peak load
reaches 20 and above, always with low iowait%.
I see this as a clear sign of more processors power need.
I'm aware of the context-switching storm problem, but here
the cs stays well under 50,000, so I think it's not the problem
here.
Current machine is an Acer Altos R700 (2 Xeon 2.8 Ghz, 4 Gb RAM),
similar to this one (R710):
http://www.acer.co.uk/acereuro/page9.do?sp=page4&dau34.oid=7036&UserCtxParam=0&GroupCtxP...
So, I'm looking for advice on a mid-range OLTP server with
the following (flexible) requirements:
- 4 physical processors expandable to 8 (dual core preferred),
either Intel or AMD
- 8 Gb RAM exp. to at least 32 Gb
- Compatibility with Acer S300 External storage enclosure.
The "old" server uses that, and it is boxed with 15krpm hdds
in RAID-10, which do perfectly well their job.
The enclosure is connected via 2 x LSI Logic PCI U320 controllers
- On-site, same-day hardware support contract
- Rack mount
Machines we're evaluating currently include:
- Acer Altos R910
- Sun Fire V40Z,
- HP Integrity RX4640
- IBM eServer 460
Experiences on these machines?
Other suggestions?
Thanks.
--
Cosimo
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Subject: Re: Looking for hw suggestions for high concurrency OLTP app
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