From owner-freebsd-hackers@FreeBSD.ORG Thu Oct 21 14:39:48 2010 Return-Path: Delivered-To: freebsd-hackers@freebsd.org Received: from mx1.freebsd.org (mx1.freebsd.org [IPv6:2001:4f8:fff6::34]) by hub.freebsd.org (Postfix) with ESMTP id 604C1106564A; Thu, 21 Oct 2010 14:39:48 +0000 (UTC) (envelope-from des@des.no) Received: from smtp.des.no (smtp.des.no [194.63.250.102]) by mx1.freebsd.org (Postfix) with ESMTP id 1B5878FC17; Thu, 21 Oct 2010 14:39:47 +0000 (UTC) Received: from ds4.des.no (des.no [84.49.246.2]) by smtp.des.no (Postfix) with ESMTP id DEEE11FFC38; Thu, 21 Oct 2010 14:39:46 +0000 (UTC) Received: by ds4.des.no (Postfix, from userid 1001) id A874D8454C; Thu, 21 Oct 2010 16:35:06 +0200 (CEST) From: =?utf-8?Q?Dag-Erling_Sm=C3=B8rgrav?= To: Bruce Cran References: <201009161742.24228.tijl@coosemans.org> <201009161619.o8GGJAmv035378@lurza.secnetix.de> <20101018155944.GA12425@freebsd.org> <868w1r92rf.fsf@ds4.des.no> <20101021122110.GA65490@freebsd.org> <86zku77mj6.fsf@ds4.des.no> <20101021135442.000054c9@unknown> Date: Thu, 21 Oct 2010 16:35:06 +0200 In-Reply-To: <20101021135442.000054c9@unknown> (Bruce Cran's message of "Thu, 21 Oct 2010 13:54:42 +0100") Message-ID: <86vd4v7gx1.fsf@ds4.des.no> User-Agent: Gnus/5.13 (Gnus v5.13) Emacs/23.2 (berkeley-unix) MIME-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: quoted-printable Cc: Alexander Best , mav@freebsd.org, Tijl Coosemans , Oliver Fromme , freebsd-hackers@freebsd.org Subject: Re: Summary: Re: Spin down HDD after disk sync or before power off X-BeenThere: freebsd-hackers@freebsd.org X-Mailman-Version: 2.1.5 Precedence: list List-Id: Technical Discussions relating to FreeBSD List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Thu, 21 Oct 2010 14:39:48 -0000 Bruce Cran writes: > Do we think our users are silly enough to set a short timeout of just a > few minutes? I'd think most would use a setting of 20-30 minutes at > a minimum. I never did understand why there were so many warnings; > after all, some laptops even come with a default APM scheme in their > HDDs that powers the disk down after 7 seconds! Really? That would make the system close to unusable, and the disk's life expectancy would be reduced to a few months; a disk that performs two load / unload cycles per minute on average will need replacing after three to six months. Remember, there was a huge flap a couple of years when Ubuntu shipped with a default timeout of 90 seconds, which is more than ten times more than what you suggest. DES --=20 Dag-Erling Sm=C3=B8rgrav - des@des.no