Received: from localhost (maia-2.hub.org [200.46.204.187]) by postgresql.org (Postfix) with ESMTP id F357C9FB2D8 for ; Thu, 5 Apr 2007 18:13:41 -0300 (ADT) Received: from postgresql.org ([200.46.204.71]) by localhost (mx1.hub.org [200.46.204.187]) (amavisd-maia, port 10024) with ESMTP id 12340-01 for ; Thu, 5 Apr 2007 18:13:34 -0300 (ADT) X-Greylist: from auto-whitelisted by SQLgrey-1.7.4 Received: from exchange.g2switchworks.com (mail.g2switchworks.com [63.87.162.25]) by postgresql.org (Postfix) with ESMTP id F1B329FB33B for ; Thu, 5 Apr 2007 18:13:37 -0300 (ADT) Received: from 10.10.1.37 ([10.10.1.37]) by exchange.g2switchworks.com ([10.10.1.2]) with Microsoft Exchange Server HTTP-DAV ; Thu, 5 Apr 2007 21:13:32 +0000 Received: from state.g2switchworks.com by mail.g2switchworks.com; 05 Apr 2007 16:13:32 -0500 Subject: Re: SCSI vs SATA From: Scott Marlowe To: James Mansion Cc: Tom Lane , Bruce Momjian , "Joshua D. Drake" , mark@mark.mielke.cc, Andreas Kostyrka , jason@ohloh.net, Geoff Tolley , pgsql-performance@postgresql.org In-Reply-To: References: Content-Type: text/plain Content-Transfer-Encoding: 7bit Message-Id: <1175807611.9839.120.camel@state.g2switchworks.com> Mime-Version: 1.0 X-Mailer: Ximian Evolution 1.4.6 (1.4.6-2) Date: Thu, 05 Apr 2007 16:13:32 -0500 X-Virus-Scanned: Maia Mailguard 1.0.1 X-Archive-Number: 200704/137 X-Sequence-Number: 24014 On Thu, 2007-04-05 at 14:30, James Mansion wrote: > >Server drives are generally more tolerant of higher temperatures. I.e. > >the failure rate for consumer and server class HDs may be about the same > >at 40 degrees C, but by the time the internal case temps get up to 60-70 > >degrees C, the consumer grade drives will likely be failing at a much > >higher rate, whether they're working hard or not. > > Can you cite any statistical evidence for this? Logic? Mechanical devices have decreasing MTBF when run in hotter environments, often at non-linear rates. Server class drives are designed with a longer lifespan in mind. Server class hard drives are rated at higher temperatures than desktop drives. Google can supply any numbers to fill those facts in, but I found a dozen or so data sheets for various enterprise versus desktop drives in a matter of minutes.