From: Alejandro Carrillo <fasterzip@yahoo.es>
To: Merlin Moncure <mmoncure@gmail.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: SSD selection
Date: Wed, 16 May 2012 20:01:02 +0100 (BST)
Message-ID: <1337194862.64694.YahooMailNeo@web171006.mail.ukl.yahoo.com> (raw)
In-Reply-To: <CAHyXU0zf0HXJ--jdGOOva8NnNfGr9q9H6n8MJPjQU5fY=+KCKg@mail.gmail.com>
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<CAFnxYwg8dMW_bihikwd8BNJBn_vN7wJB9nHe9umAdS3QWhHVcA@mail.gmail.com>
<4FB2B5C8.7030109@boreham.org>
<CAHyXU0y6yrDL6NwBEC_DLDEQoqsyfj8i-p2iOP71--vSzZpZTg@mail.gmail.com>
<4FB3E7C3.7070209@boreham.org>
<CAHyXU0zf0HXJ--jdGOOva8NnNfGr9q9H6n8MJPjQU5fY=+KCKg@mail.gmail.com>
¿Wizard Merlin?
>________________________________
> De: Merlin Moncure <mmoncure@gmail.com>
>Para: David Boreham <david_list@boreham.org>
>CC: pgsql-performance@postgresql.org
>Enviado: Miércoles 16 de Mayo de 2012 13:53
>Asunto: Re: [PERFORM] SSD selection
>
>On Wed, May 16, 2012 at 12:45 PM, David Boreham <david_list@boreham.org> 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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>
>
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To: pgsql-performance@postgresql.org
Cc: fasterzip@yahoo.es, mmoncure@gmail.com
Subject: Re: SSD selection
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