From: | Ivan Voras <ivoras(at)freebsd(dot)org> |
---|---|
To: | pgsql-performance(at)postgresql(dot)org |
Subject: | Re: SSD + RAID |
Date: | 2009-11-14 10:42:45 |
Message-ID: | hdm1j4$pmf$1@ger.gmane.org |
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Thread: | |
Lists: | pgsql-performance |
Lists wrote:
> Laszlo Nagy wrote:
>> Hello,
>>
>> I'm about to buy SSD drive(s) for a database. For decision making, I
>> used this tech report:
>>
>> http://techreport.com/articles.x/16255/9
>> http://techreport.com/articles.x/16255/10
>>
>> Here are my concerns:
>>
>> * I need at least 32GB disk space. So DRAM based SSD is not a real
>> option. I would have to buy 8x4GB memory, costs a fortune. And
>> then it would still not have redundancy.
>> * I could buy two X25-E drives and have 32GB disk space, and some
>> redundancy. This would cost about $1600, not counting the RAID
>> controller. It is on the edge.
> This was the solution I went with (4 drives in a raid 10 actually). Not
> a cheap solution, but the performance is amazing.
I've came across this article:
It's from a Linux MySQL user so it's a bit confusing but it looks like
he has some reservations about performance vs reliability of the Intel
drives - apparently they have their own write cache and when it's
disabled performance drops sharply.
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