Re: ORION results

  • From: Jared Still <jkstill@xxxxxxxxx>
  • To: Freek.DHooge@xxxxxxxxx
  • Date: Fri, 29 Jan 2010 10:16:57 -0800

On Fri, Jan 29, 2010 at 8:10 AM, D'Hooge Freek <Freek.DHooge@xxxxxxxxx>wrote:

> I think block devices are buffered, so you would need to use raw devices
> (or open de block devices with the O_DIRECT flag).
>
>
... or use a benchmark that will obliterate the cache and let you see with
real IO of the storage.

I did that once a few years ago and graphed it - it was quite interesting to
see IO's come down
and disk utilization go up and meet at a point predicted by reading the spec
sheet of the drives.

Unfortunately I seem to have lost that file with the graph in it.


Jared Still
Certifiable Oracle DBA and Part Time Perl Evangelist
Oracle Blog: http://jkstill.blogspot.com
Home Page: http://jaredstill.com

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