From mboxrd@z Thu Jan 1 00:00:00 1970 From: Aryeh Gregor Subject: Re: RAID Class Drives` Date: Fri, 19 Mar 2010 12:43:15 -0400 Message-ID: <7c2a12e21003190943t546ade49u2294310ed7d9921e@mail.gmail.com> References: <7db987b31003170648j19e3346bi1050e703ef8c811c@mail.gmail.com> <4BA258AD.5020605@gmx.net> <4BA33284.7000304@anonymous.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: In-Reply-To: <4BA33284.7000304@anonymous.org.uk> Sender: linux-raid-owner@vger.kernel.org To: John Robinson Cc: Joachim Otahal , linux-raid@vger.kernel.org List-Id: linux-raid.ids On Fri, Mar 19, 2010 at 4:15 AM, John Robinson wrote: > Do you have a reference for this? Most drives' operating temperature = range > is specified up to 55=C2=B0C, sometimes higher for enterprise drives,= without any > indication (apart from common sense perhaps) that running them this h= ot > reduces lifespan. Google's study of >100,000 disks over 9 months or so suggests that hotter drives don't fail much more often: ". . . failures do not increase when the average temperature increases. In fact, there is a clear trend showing that lower temperatures are associated with higher failure rates. Only at very high temperatures is there a slight reversal of this trend." (page 5 of PDF) "We can conclude that at moderate temperature ranges it is likely that there are other effects which affect failure rates much more strongly than temperatures do." (page 6) They were using SATA and PATA consumer drives, 5400 RPM to 7200 RPM, 80 to 400 GB, put into production in or after 2001 (from page 3). -- To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html