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From: =?ISO-8859-1?Q?C=E9dric_Villemain?= <cedric.villemain.debian@gmail.com>
Date: Tue, 10 May 2011 01:52:01 +0200
Message-ID: <BANLkTikecJCGWH0WyKFiSnC08kmcwS7FqA@mail.gmail.com>
Subject: Re: Benchmarking a large server
To: Chris Hoover <revoohc@gmail.com>
Cc: PGSQL Performance <pgsql-performance@postgresql.org>
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2011/5/9 Chris Hoover <revoohc@gmail.com>:
> I've got a fun problem.
> My employer just purchased some new db servers that are very large. =A0Th=
e
> specs on them are:
> 4 Intel X7550 CPU's (32 physical cores, HT turned off)
> 1 TB Ram
> 1.3 TB Fusion IO (2 1.3 TB Fusion IO Duo cards in a raid 10)
> 3TB Sas Array (48 15K 146GB spindles)
> The issue we are running into is how do we benchmark this server,
> specifically, how do we get valid benchmarks for the Fusion IO card?
> =A0Normally to eliminate the cache effect, you run iozone and other bench=
mark
> suites at 2x the ram. =A0However, we can't do that due to 2TB > 1.3TB.
> So, does anyone have any suggestions/experiences in benchmarking storage
> when the storage is smaller then 2x memory?

You can reduce the memory size on server boot.
If you use linux, you can add a 'mem=3D512G' to your boot time
parameters. (maybe it supports only K or M, so 512*1024...)

> Thanks,
> Chris


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