From owner-freebsd-questions@freebsd.org Wed Sep 14 20:25:54 2016 Return-Path: Delivered-To: freebsd-questions@mailman.ysv.freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:1900:2254:206a::19:1]) by mailman.ysv.freebsd.org (Postfix) with ESMTP id 71E47BDAC9F for ; Wed, 14 Sep 2016 20:25:54 +0000 (UTC) (envelope-from rwmaillists@googlemail.com) Received: from mail-wm0-x22c.google.com (mail-wm0-x22c.google.com [IPv6:2a00:1450:400c:c09::22c]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (Client CN "smtp.gmail.com", Issuer "Google Internet Authority G2" (verified OK)) by mx1.freebsd.org (Postfix) with ESMTPS id 0EAB11A0A for ; Wed, 14 Sep 2016 20:25:54 +0000 (UTC) (envelope-from rwmaillists@googlemail.com) Received: by mail-wm0-x22c.google.com with SMTP id 1so53487037wmz.1 for ; Wed, 14 Sep 2016 13:25:53 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=googlemail.com; s=20120113; h=date:from:to:subject:message-id:in-reply-to:references:mime-version :content-transfer-encoding; bh=BO1WLnK5bbb+3xd9yx/BDYjR1xv/LouaDUYZ1xT6akw=; b=zKQh7ij+fi1Qcl+sg6J+3oCkBIq/XtmuqFrkE/DM+XJinSOeLdCthPao7+VQiL3Hly qP+xgn7g/CVwG6JCeYkSDiLHCpVOA00oRey9gY9kWcgWh0nY6jgr9pLxv80m9qMkZjH6 RrDf4ZqbOPvw8eJrMxKg4Vwm5JHbwfD3xbiVobqdJbgVqa9hUpA8lblfexCu+WU8Cemr 57oO2omdVeOjYehBK9R+Evbs2oku/lcv3m+1J9sFWnaaUKRGFIZgnTYVFzqW7PMRccHg I8t9wyK63LM6uG+mW4yFk4FC4hIRfpIXneB3Wych6Tpq8r0hyq6nlqPREj3nOOyc29nz RhuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20130820; h=x-gm-message-state:date:from:to:subject:message-id:in-reply-to :references:mime-version:content-transfer-encoding; bh=BO1WLnK5bbb+3xd9yx/BDYjR1xv/LouaDUYZ1xT6akw=; b=YAdHuvr9ok/grgdvIKSeSvtV8bx6XhJnefaV65KW5Fb0oXDB6+nrJ+/GjPCoPeuHoV QAab7+UqxkX2YJ6ag+T0GUkO5//xgcublfjvPPxLQwUZRBHFHQrNNG2CAlBaTnOPQaQ/ J1EhnOKgi1NX/WVHnzmA3yNg/TzkFvk8PuYii0M9Ot673k0BjSpBekF/qICyQgCr7/De nnaexCfrSM4hJ1G2Y2AgZmZJFzMkRzXpXDyIw2HCDpssS2LKfpu8T5rYuQmIeOtIjCyT twBpDoPgq+BtryvtuShT7RO7OCtxaLFUBHHh2i8xJ4L7lz49xZuM+rzsV9KX+O6ZV6tL 4ChA== X-Gm-Message-State: AE9vXwMTvToI/Jom/R7JPzMOEbW2ro6XeRgzusaZqwMkGIAIj402sAhWyidBjIB04we85w== X-Received: by 10.194.89.129 with SMTP id bo1mr4321813wjb.105.1473884752351; Wed, 14 Sep 2016 13:25:52 -0700 (PDT) Received: from gumby.homeunix.com ([81.17.24.158]) by smtp.gmail.com with ESMTPSA id c134sm6296302wme.5.2016.09.14.13.25.50 for (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Wed, 14 Sep 2016 13:25:51 -0700 (PDT) Date: Wed, 14 Sep 2016 21:25:45 +0100 From: RW To: freebsd-questions@freebsd.org Subject: Re: Best kind of hard drive for heavy use? Message-ID: <20160914212545.144b0719@gumby.homeunix.com> In-Reply-To: <12225.128.135.52.6.1473864923.squirrel@cosmo.uchicago.edu> References: <42.56.05022.D3A48D75@dnvrco-oedge02> <20160913213649.3a3f26b2@archlinux.localdomain> <0d1b8dba-3292-9991-ea7d-f160c25090c8@netfence.it> <20160914051806.297c0c3f@archlinux.localdomain> <20160914143327.3b7d3c36@gumby.homeunix.com> <12225.128.135.52.6.1473864923.squirrel@cosmo.uchicago.edu> X-Mailer: Claws Mail 3.14.0 (GTK+ 2.24.29; amd64-portbld-freebsd10.3) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Wed, 14 Sep 2016 20:25:54 -0000 On Wed, 14 Sep 2016 09:55:23 -0500 (CDT) Valeri Galtsev wrote: > On Wed, September 14, 2016 8:33 am, RW via freebsd-questions wrote: > > Drives are typically rated for 300k load-cycles, so at 30 minutes > > it's a non-issue - running the drive cooler and avoiding wear on > > the moving parts probably extends its life. > > > > Disagree. It is actually an opposite. Spinning down is the same as > turning the drive off: ... This is a big stress, and mechanism can > withstand only this number of such bangs. And the manufacturer quotes a value for that number of 300,000. The problematic WD drives went into standby after a fraction of a minute, so it was possible for them to fail prematurely. With a 30 minute timeout it would take 17 years of pathologically bad misuse to reach the rated value. > To the contrary, keeping > platters spinning does not apply any stress onto any mechanical > parts, except bearings, which can live very long, especially if > platter assembly is very well balanced and bearings are well designed > and manufactured. But you go on to say that consumer grade drives aren't designed to spin for a long-time which contradicts that. > In any case, "consumer" grade drives never come > to composite time of use like 8-10 years (drives on many servers are > up and always hot for about this long), As it happens I have a dock next to my TV that contains two drive that were manufactured in 2005 and 2009 and they are both still in good condition. If they'd being spinning 24/7 they'd both be long since dead. It seems to me that if you want to maximize the life of a consumer drive you have to let it spin-down.