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Re: SSD and RAID

From: Andrea Suisani <sickpig(at)opinioni(dot)net>
To: Yeb Havinga <yebhavinga(at)gmail(dot)com>
Cc: Mark Kirkwood <mark(dot)kirkwood(at)catalyst(dot)net(dot)nz>, pgsql-performance(at)postgresql(dot)org
Subject: Re: SSD and RAID
Date: 2012-03-06 09:56:22
Message-ID: 4F55DF46.3020804@opinioni.net (view raw or flat)
Thread:
Lists: pgsql-performance
On 03/06/2012 10:34 AM, Yeb Havinga wrote:
> On 2012-03-06 09:34, Andrea Suisani wrote:
>> On 03/06/2012 09:17 AM, Yeb Havinga wrote:
>>>
>>> PS: we applied the same philosophy (different brands) also to motherboards, io controllers and memory, but after testing, we liked one IO controllers software so much more than the other so we chose to have only one. Also stream memory performance of one motherboard showed a significant performance
>>> regression in the higher thread counts that we decided to go for the other brand for all servers.
>>>
>>
>> care to share motherboard winning model?
>>
>> thanks
>> Andrea
>>
>
> On http://i.imgur.com/vfmvu.png is a graph of three systems, made with the multi stream scaling (average of 10 tests if I remember correctly) test.
>
> The red and blue are 2 X 12 core opteron 6168 systems with 64 GB DDR3 1333MHz in 8GB dimms
>
> Red is a Tyan S8230
> Blue is a Supermicro H8DGI-G
>
> We tried a lot of things to rule out motherboards, such as swap memory of both systems, ensure BIOS settings are similar (e.g. ECC mode), update to latest BIOS where possible, but none of those settings improved the memory performance drop. Both systems were installed with kickstarted Centos 6.2, so
> also no kernel setting differences there..
>
> regards,
> Yeb


thanks for sharing those infos

Andrea

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