From mboxrd@z Thu Jan 1 00:00:00 1970 From: Joachim Otahal Subject: Re: RAID Class Drives` Date: Fri, 19 Mar 2010 18:53:33 +0100 Message-ID: <4BA3BA1D.50206@gmx.net> References: <7db987b31003170648j19e3346bi1050e703ef8c811c@mail.gmail.com> <4BA258AD.5020605@gmx.net> <4BA33284.7000304@anonymous.org.uk> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed 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: linux-raid@vger.kernel.org List-Id: linux-raid.ids John Robinson schrieb: > On 18/03/2010 16:45, Joachim Otahal wrote: >> [...] You should take care of the temperature of the drives, >> 30=B0C to 35=B0C is preferred, above 35=B0C the lifespan goes down, = over=20 >> 40=B0C rapidly down. > > Do you have a reference for this? Most drives' operating temperature=20 > range is specified up to 55=B0C, sometimes higher for enterprise driv= es,=20 > without any indication (apart from common sense perhaps) that running= =20 > them this hot reduces lifespan. > > Cheers, > > John. > About a half year ago the german publisher c't did this testing (or=20 reported from a big testing, cannot remember) what the best temperature= =20 of desktop drives is. The statistic varied from drive to drive since=20 some are less than 5=B0C over room temperature, others are 15=B0C or mo= re=20 over room temperature (of course mounted behind a silent fan which keep= s=20 the air moving, no turbine mode). The result was that 10=B0C and 15=B0C are not good for the drives. The=20 "perfect sweet spot" changes from drive to drive (even within on=20 manufacturer), but all of them had their sweet spot somewhere around=20 20=B0C to to 35=B0C with variation in the range of measurement error. Some drives has a higher failure rate at 40=B0C, for some 55=B0C was no= =20 problem at all and showed no real change in the failure rate. The last=20 two examples were the extreme cases. Some of my drives are 2=B0C above room temperature, others are 12=B0C o= ver=20 room temperature. Sine I really take care that non reaches 40=B0C even = in=20 summer the failure rate got down from "every few month" to once in the = 3=20 years which is the time I really take care of the drive temperatures.=20 There are 6 drives currently in use from 750GB (the hottest of all my=20 drives) up to 1.5 TB in my private machines, only one of them shows a=20 gradual change in the SMART values (reallocated sector count), which=20 mean it will probably fail in about 1.5 years if the error rate stays=20 constant. At work (at least the two machines 100% under my control) I=20 had the same effect, keep the HD's cool and they will live long, let=20 them get over 40=B0C and be ready to replace them soon. Joachim Otahal -- 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