Re: Planning a new server - help needed

From: Guy Rouillier <guyr-ml1(at)burntmail(dot)com>
To: pgsql-performance(at)postgresql(dot)org
Subject: Re: Planning a new server - help needed
Date: 2008-03-31 02:25:36
Message-ID: 47F04BA0.9040409@burntmail.com
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PFC wrote:
>
>> Why do you claim that 'More platters also means slower seeks
>> and generally slower performance.'?
>
> More platters -> more heads -> heavier head assembly -> slower seek
> time
> But..
> More platters -> higher density -> less seek distance (in mm of head
> movement) -> faster seek time

More platters means more tracks under the read heads at a time, so
generally *better* performance. All other things (like rotational
speed) being equal, of course.

--
Guy Rouillier

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