From owner-freebsd-questions@freebsd.org Tue Apr 19 20:57:59 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 A820BB15C6C for ; Tue, 19 Apr 2016 20:57:59 +0000 (UTC) (envelope-from galtsev@kicp.uchicago.edu) Received: from cosmo.uchicago.edu (cosmo.uchicago.edu [128.135.70.90]) by mx1.freebsd.org (Postfix) with ESMTP id 884FE1BB7 for ; Tue, 19 Apr 2016 20:57:59 +0000 (UTC) (envelope-from galtsev@kicp.uchicago.edu) Received: by cosmo.uchicago.edu (Postfix, from userid 48) id 4ED52CB8C9C; Tue, 19 Apr 2016 15:57:53 -0500 (CDT) Received: from 128.135.52.6 (SquirrelMail authenticated user valeri) by cosmo.uchicago.edu with HTTP; Tue, 19 Apr 2016 15:57:53 -0500 (CDT) Message-ID: <33157.128.135.52.6.1461099473.squirrel@cosmo.uchicago.edu> In-Reply-To: References: <571533F4.8040406@bananmonarki.se> <57153E6B.6090200@gmail.com> <20160418210257.GB86917@neutralgood.org> <64031.128.135.52.6.1461017122.squirrel@cosmo.uchicago.edu> <20160419153824.7b679129f82a3cd0b18b9740@sohara.org> <40267.128.135.52.6.1461098148.squirrel@cosmo.uchicago.edu> Date: Tue, 19 Apr 2016 15:57:53 -0500 (CDT) Subject: Re: Raid 1+0 From: "Valeri Galtsev" To: nightrecon@hotmail.com Cc: freebsd-questions@freebsd.org Reply-To: galtsev@kicp.uchicago.edu User-Agent: SquirrelMail/1.4.8-5.el5.centos.7 MIME-Version: 1.0 Content-Type: text/plain;charset=iso-8859-1 Content-Transfer-Encoding: 8bit X-Priority: 3 (Normal) Importance: Normal X-BeenThere: freebsd-questions@freebsd.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: User questions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Tue, 19 Apr 2016 20:57:59 -0000 On Tue, April 19, 2016 3:43 pm, Michael Powell wrote: > Valeri Galtsev wrote: > >> >> >> On Tue, April 19, 2016 9:38 am, Steve O'Hara-Smith wrote: >>> On Mon, 18 Apr 2016 17:05:22 -0500 (CDT) >>> "Valeri Galtsev" wrote: >>> >>>> Not correct. First of all, in most of the cases, failure of each of >>>> the >>>> drives are independent events >>> >>> If only that were so. When the drives are as near identical as >>> manufacturing can make them and have had very similar histories they >>> can >>> be >>> expected to have very similar wear and be similarly close to failure at >>> all >>> times, which makes it likely that the load imposed by one failing will >>> push >>> another over. >> >> Sigh. You need suggest some physics that will make one drive affect >> another (aged or not aged doesn't matter for me). Then you will have me >> in >> your team. > > Vibration is kinetic energy. :-) Cool! No I don't think drives in my enclosures resonate in unison. Fans give enclosure much more vibration IMHO. Further, how died drive changes that vibration pattern and causes another drive go bad with him!? I guess, you go to your church and I go to mine (read: University Physics or Mathematics class instead of church ;-) Valeri > > -Mike > > > > _______________________________________________ > freebsd-questions@freebsd.org mailing list > https://lists.freebsd.org/mailman/listinfo/freebsd-questions > To unsubscribe, send any mail to > "freebsd-questions-unsubscribe@freebsd.org" > ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++