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Re: raid10 hard disk choice

From: Robert Haas <robertmhaas(at)gmail(dot)com>
To: Matthew Wakeling <matthew(at)flymine(dot)org>
Cc: pgsql-performance(at)postgresql(dot)org
Subject: Re: raid10 hard disk choice
Date: 2009-05-21 20:29:01
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-performance
On Thu, May 21, 2009 at 8:59 AM, Matthew Wakeling <matthew(at)flymine(dot)org> wrote:
> On Thu, 21 May 2009, Linos wrote:
>>        i have to buy a new server and in the budget i have (small) i have
>> to select one of this two options:
>> -4 sas 146gb 15k rpm raid10.
>> -8 sas 146gb 10k rpm raid10.
> It depends what you are doing. I think in most situations, the second option
> is better, but there may be a few situations where the reverse is true.

One possible case of this - I believe that 15K drives will allow you
to commit ~250 times per second (15K/60) vs. ~166 times per second
(10K/60).  If you have a lot of small write transactions, this might
be an issue.


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