| 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: | 603c8f070905211329v7d648047u2b2b27e5ce59cce3@mail.gmail.com |
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| Thread: | |
| 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.
...Robert
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