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From: David Boreham <david_list@boreham.org>
To: pgsql-performance@postgresql.org
Subject: Re: SSD selection
Date: Wed, 16 May 2012 11:45:39 -0600
Message-ID: <4FB3E7C3.7070209@boreham.org> (raw)
In-Reply-To: <CAHyXU0y6yrDL6NwBEC_DLDEQoqsyfj8i-p2iOP71--vSzZpZTg@mail.gmail.com>
References: <CABWW-d032_BBZCi-z5=1H-4SrytKEtE10=TAu3uOTa-BnHUU6Q@mail.gmail.com>
	<CAFnxYwg8dMW_bihikwd8BNJBn_vN7wJB9nHe9umAdS3QWhHVcA@mail.gmail.com>
	<4FB2B5C8.7030109@boreham.org>
	<CAHyXU0y6yrDL6NwBEC_DLDEQoqsyfj8i-p2iOP71--vSzZpZTg@mail.gmail.com>

On 5/16/2012 11:01 AM, Merlin Moncure wrote:
> Although your assertion 100% supported by intel's marketing numbers,
> there are some contradicting numbers out there that show the drives
> offering pretty similar performance.  For example, look here:
> http://www.anandtech.com/show/4902/intel-ssd-710-200gb-review/4  and
> you can see that 4k aligned writes are giving quite similar results
> (14k iops) even though the 710 is only rated for 2700 iops while the
> 320 is rated for 21000 IOPS.  Other benchmarks also show similar
> results.
Actually I said the same thing you're saying : that the two series will 
deliver similar performance.

The spec numbers however would be for worst case conditions (in the case 
of the 710).
I'm not convinced that those tests were exercising the worst case part 
of the envelope.





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