Re: Benchmarking a large server

2011/5/9 Chris Hoover <revoohc(at)gmail(dot)com>:
> I've got a fun problem.
> My employer just purchased some new db servers that are very large.  The
> 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?
>  Normally to eliminate the cache effect, you run iozone and other benchmark
> suites at 2x the ram.  However, 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=512G' to your boot time
parameters. (maybe it supports only K or M, so 512*1024...)

> Thanks,
> Chris

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Cédric Villemain               2ndQuadrant
http://2ndQuadrant.fr/     PostgreSQL : Expertise, Formation et Support