Received: from localhost (unknown [200.46.204.184]) by developer.postgresql.org (Postfix) with ESMTP id 1D9EF2E003C for ; Mon, 31 Mar 2008 00:15:10 -0300 (ADT) Received: from developer.postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.184]) (amavisd-maia, port 10024) with ESMTP id 12663-01 for ; Mon, 31 Mar 2008 00:15:05 -0300 (ADT) X-Greylist: delayed 00:49:30.290415 by SQLgrey-1.7.5 Received: from mx02.burntmail.com (7a.3f.5746.static.theplanet.com [70.87.63.122]) by developer.postgresql.org (Postfix) with ESMTP id E30782E0035 for ; Mon, 31 Mar 2008 00:15:03 -0300 (ADT) Received: from pool-72-66-98-179.washdc.fios.verizon.net ([72.66.98.179] helo=[127.0.0.1]) by mx02.burntmail.com with esmtpa (Exim 4.63) (envelope-from ) id 1Jg9iN-00087P-1m for pgsql-performance@postgresql.org; Sun, 30 Mar 2008 21:25:39 -0500 Message-ID: <47F04BA0.9040409@burntmail.com> Date: Sun, 30 Mar 2008 22:25:36 -0400 From: Guy Rouillier User-Agent: Thunderbird 2.0.0.12 (Windows/20080213) MIME-Version: 1.0 To: pgsql-performance@postgresql.org Subject: Re: Planning a new server - help needed References: <47ECB4F6.1040901@shopzeus.com> <47EE1B1F.20506@mansionfamily.plus.com> In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Antivirus: avast! (VPS 080330-0, 03/30/2008), Outbound message X-Antivirus-Status: Clean X-Archive-Number: 200803/525 X-Sequence-Number: 29479 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