Re: Do I have a hardware or a software problem?

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Evgeny Shishkin
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Re: Do I have a hardware or a software problem?
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3ADBD9A3-966F-40E8-AF78-0F2093D79BEE@gmail.com
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Do I have a hardware or a software problem? Niels Kristian Schjødt <nielskristian@autouncle.com>
Re: Do I have a hardware or a software problem? Jeff Janes <jeff.janes@gmail.com>
Re: Do I have a hardware or a software problem? Niels Kristian Schjødt <nielskristian@autouncle.com>
Re: Do I have a hardware or a software problem? Craig Ringer <craig@2ndQuadrant.com>
Re: Do I have a hardware or a software problem? Niels Kristian Schjødt <nielskristian@autouncle.com>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? Niels Kristian Schjødt <nielskristian@autouncle.com>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? Niels Kristian Schjødt <nielskristian@autouncle.com>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? Craig Ringer <craig@2ndQuadrant.com>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? Craig Ringer <craig@2ndQuadrant.com>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? Craig Ringer <craig@2ndQuadrant.com>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? David Boreham <david_list@boreham.org>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? David Boreham <david_list@boreham.org>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? David Boreham <david_list@boreham.org>
Re: Do I have a hardware or a software problem? Mark Kirkwood <mark.kirkwood@catalyst.net.nz>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? David Boreham <david_list@boreham.org>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>
Re: Do I have a hardware or a software problem? David Boreham <david_list@boreham.org>
Re: Do I have a hardware or a software problem? Craig Ringer <craig@2ndQuadrant.com>
Re: Do I have a hardware or a software problem? Niels Kristian Schjødt <nielskristian@autouncle.com>
Re: Do I have a hardware or a software problem? Craig Ringer <craig@2ndquadrant.com>
Re: Do I have a hardware or a software problem? Rosser Schwarz <rosser.schwarz@gmail.com>
Re: Do I have a hardware or a software problem? Scott Marlowe <scott.marlowe@gmail.com>
Re: Do I have a hardware or a software problem? Jeff Janes <jeff.janes@gmail.com>
Re: Do I have a hardware or a software problem? Niels Kristian Schjødt <nielskristian@autouncle.com>
Re: Do I have a hardware or a software problem? Jeff Janes <jeff.janes@gmail.com>
Re: Do I have a hardware or a software problem? Evgeny Shishkin <itparanoia@gmail.com>

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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