Received: from localhost (unknown [200.46.204.184]) by postgresql.org (Postfix) with ESMTP id EA1DE9FC5C3 for ; Thu, 1 Nov 2007 17:11:53 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.184]) (amavisd-maia, port 10024) with ESMTP id 62673-02-8 for ; Thu, 1 Nov 2007 17:11:30 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.5 Received: from polaris.pinpointresearch.com (66-7-238-130.static-ip.telepacific.net [66.7.238.130]) by postgresql.org (Postfix) with ESMTP id 917EB9FD57B for ; Thu, 1 Nov 2007 15:16:14 -0300 (ADT) Received: from [192.168.1.179] (betelgeuse.pinpointresearch.com [192.168.1.179]) by polaris.pinpointresearch.com (Postfix) with ESMTP id 67708E00EC84; Thu, 1 Nov 2007 11:16:13 -0700 (PDT) Message-ID: <472A17ED.1070008@pinpointresearch.com> Date: Thu, 01 Nov 2007 11:16:13 -0700 From: Steve Crawford User-Agent: Thunderbird 1.5.0.10 (X11/20060911) MIME-Version: 1.0 To: Magnus Hagander CC: Ow Mun Heng , Tomas Vondra , Ketema , pgsql-performance@postgresql.org Subject: Re: Hardware for PostgreSQL References: <1193849108.591961.103570@22g2000hsm.googlegroups.com> <4728FAA1.7060905@fuzzy.cz> <1193889182.7999.71.camel@neuromancer.home.net> <4729783A.2030201@hagander.net> <1193903161.9148.27.camel@neuromancer.home.net> <472985B5.6010701@hagander.net> In-Reply-To: <472985B5.6010701@hagander.net> Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 7bit X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200711/22 X-Sequence-Number: 27437 Magnus Hagander wrote: > Ow Mun Heng wrote: >>> You're likely better off (performance-wise) putting it on the same disk >>> as the database itself if that one has better RAID, for example. >> I'm thinking along the lines of since nothing much writes to the OS >> Disk, I should(keyword) be safe. > > Unless it's *always* in the cache (not so likely), reads will also move > the heads... And if you aren't mounted noatime, reads will also cause a write. Cheers, Steve