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Re: SSD selection



¿Wizard Merlin?


De: Merlin Moncure <mmoncure@xxxxxxxxx>
Para: David Boreham <david_list@xxxxxxxxxxx>
CC: pgsql-performance@xxxxxxxxxxxxxx
Enviado: Miércoles 16 de Mayo de 2012 13:53
Asunto: Re: SSD selection

On Wed, May 16, 2012 at 12:45 PM, David Boreham <david_list@xxxxxxxxxxx> wrote:
> 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.

Yeah -- you might be right -- their numbers are based on iometer which
looks like it runs lower than other tests (see here:
http://www.storagereview.com/intel_ssd_710_series_review_200gb).  I
still find it interesting the 320 is spec'd so much higher though.  I
guess I spoke to soon -- it looks it has to do with the life extending
attributes of the drive.  Benchmarks are all over the place though.

merlin

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