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From: Evgeny Shishkin <itparanoia@gmail.com>
To: Craig Ringer <craig@2ndQuadrant.com>
Cc: Niels Kristian Schjødt <nielskristian@autouncle.com>
Cc: Jeff Janes <jeff.janes@gmail.com>
Cc: pgsql-performance@postgresql.org <pgsql-performance@postgresql.org>
Subject: Re: Do I have a hardware or a software problem?
Date: Wed, 12 Dec 2012 05:44:24 +0400
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On Dec 12, 2012, at 5:29 AM, Craig Ringer <craig@2ndQuadrant.com> wrote:

> On 12/12/2012 09:17 AM, Evgeny Shishkin wrote:
>> 
>> Actually most of low-end SSDs don't do write caching, they do not have enough ram for that. Sandforce for example.
>> 
> Or, worse, some of them do limited write caching but don't protect their write cache from power loss. Instant data corruption!
> 
> I would be extremely reluctant to use low-end SSDs for a database server.
> 
>> If we are talking about dedicated machine for database with ssd drives, why would anybody don't by hardware raid for about 500-700$?
> I'd want to consider whether the same money is better spent on faster, higher quality SSDs with their own fast write caches.
> 

High quality ssd costs 5-7$ per GB. Consumer grade ssd - 1$. Highend - 11$
New intel dc s3700 2-3$ per GB as far as i remember.

So far, more than a year already, i bought consumer ssds with 300-400$ hw raid. Cost effective and fast, may be not very safe, but so far so good. All data protection measures from postgresql are on, of course.
> -- 
>  Craig Ringer                   http://www.2ndQuadrant.com/
>  PostgreSQL Development, 24x7 Support, Training & Services

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