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</o:shapelayout></xml><![endif]--></head><body lang=EN-AU link=blue vlink=purple><div class=WordSection1><p class=MsoNormal><span style='mso-fareast-language:EN-US'>Excuse my apparent naivety, but I thought data centres were attached to networks? It’s apparent that only DevOps engineers are allowed to think scientifically, unlike the rest of us mere mortals. I’m sure that I’m not the only one that found Paul’s theorising quite interesting…or has the inherent Luddite atmosphere of stifling creative thought in this country now permeated into the Technosphere…?<o:p></o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><p class=MsoNormal><span style='mso-fareast-language:EN-US'><o:p> </o:p></span></p><div><div style='border:none;border-top:solid #E1E1E1 1.0pt;padding:3.0pt 0cm 0cm 0cm'><p class=MsoNormal><b><span lang=EN-US>From:</span></b><span lang=EN-US> AusNOG <ausnog-bounces@lists.ausnog.net> <b>On Behalf Of </b>James Hodgkinson<br><b>Sent:</b> Wednesday, 21 August 2019 6:36 PM<br><b>To:</b> ausnog@lists.ausnog.net<br><b>Subject:</b> Re: [AusNOG] [AUSNOG] Disk wear & Foucault Period<o:p></o:p></span></p></div></div><p class=MsoNormal><o:p> </o:p></p><div><p class=MsoNormal>Please stop thinking out loud, this is the quiet carriage. <o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>James<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>On Wed, 21 Aug 2019, at 17:17, Paul Wilkins wrote:<o:p></o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt' id=qt><div><div><p class=MsoNormal>Another thought, which is that horizontal mounting is optimal for polar regions, whereas you minimise precession at equitorial latitudes with vertical mounting (but only if the axis is north aligned), which could go some way to explaining the anecdotal stuff you hear about horizontal versus vertical mounting. Though I've yet to hear anyone asking what's your latitude before they proceed to build a data centre or installing your vertical disks arrays to be north axis aligned.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Kind regards<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Paul Wilkins<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>On Wed, 21 Aug 2019 at 16:31, Mark Smith <<a href="mailto:markzzzsmith@gmail.com">markzzzsmith@gmail.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal>How is this related to network operation? AusNOG - Australian Network Operators Group.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>You wouldn't go to a car show to ask about motorbikes - you'd to to a motorbike show, because that's where the most people interested in and having the most knowledge about motorbikes would be.<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>On Wed, 21 Aug 2019 at 15:30, Roy Adams <<a href="mailto:roy@racs.com.au">roy@racs.com.au</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Verdana",sans-serif'>Paul, I would be most interested if you hear back from them.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Verdana",sans-serif'>I am curious if even BackBlaze have considered your idea in the past.. maybe a wake up for them and others<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Verdana",sans-serif'>FYI, they produce these reports each quarter - worth calendaring to pick up.<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Verdana",sans-serif'>I was stunned at the 14TB Toshiba reliability... interestingly, 2 weeks ago that top line read 0 failures... today it says 1 - v.strange<o:p></o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><p class=MsoNormal><span style='font-size:12.0pt;font-family:"Verdana",sans-serif'><o:p> </o:p></span></p></div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><div><p class=MsoNormal><span class=font><span style='font-family:"Verdana",sans-serif;color:black'>Kindly,</span></span><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#1F497D'>ROY ADAMS<b> | </b></span></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:gray'>P</span></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#1F497D'> 07 3040 5010 | </span></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:gray'>Web:</span></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#1F497D'> <a href="http://www.racs.com.au/"><span style='color:#1155CC'>http://www.racs.com.au/</span></a> | </span></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:gray'>Wiki:</span></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#1F497D'> <a href="https://ex.racs.com.au:444/"><span style='color:#1155CC'>https://ex.racs.com.au:444/</span></a> | e</span></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:gray'>Mail:</span></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#1F497D'> <a href="mailto:roy@racs.com.au"><span style='color:#1155CC'>mailto:roy@racs.com.au</span></a></span></span><o:p></o:p></p></div><div><p class=MsoNormal><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#EEEEEE'>Please never upgrade to the latest Windows 10 - You don’t need the hassle, and I don’t need the work.</span></span><o:p></o:p></p></div><div><p class=MsoNormal><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#EEEEEE'>More seriously, the 6 month older Windows 10 releases are typically FAR MORE stable - a simple RACS script can fix this - just ask :)</span></span><span style='font-family:"Verdana",sans-serif;color:#EEEEEE'><br></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#EEEEEE'>If you think it's expensive to hire a professional to do the job, wait until you hire an amateur - Red Adair.</span></span><o:p></o:p></p></div><div><p class=MsoNormal><span class=colour><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#EEEEEE'>Life is a journey through a series of adventures.. Live them, love them, hate them, but never give up on your dreams, desires, and goals.</span></span><o:p></o:p></p></div><div><p class=MsoNormal><span class=colour><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#EEEEEE'>Have you been good today? .</span></span><span class=size><span style='font-size:7.5pt;font-family:"Nirmala UI",sans-serif;color:#EEEEEE'>ಠ</span></span><span class=size><span style='font-size:7.5pt;font-family:"Verdana",sans-serif;color:#EEEEEE'>_</span></span><span class=size><span style='font-size:7.5pt;font-family:"Nirmala UI",sans-serif;color:#EEEEEE'>ಠ</span></span><o:p></o:p></p></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div></div><div><p class=MsoNormal><o:p> </o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>On Wed, 21 Aug 2019 at 11:22, Paul Wilkins <<a href="mailto:paulwilkins369@gmail.com">paulwilkins369@gmail.com</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><p class=MsoNormal>Roy,<o:p></o:p></p></div><div><p class=MsoNormal>Those are the most comprehensive disk stats I've ever seen.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>So out of curiosity, I emailed Backblaze to ask if they'd noticed any latitudinal effect on disk wear. Not realistically expecting a response, but if they did notice a correlation, it may perhaps emerge by osmosis.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Karl, I have to think turning a 15K RPM on it's head over a, admittedly long period, has to have an effect. Cumulatively you're going to get uneven wear on the bearings. Also the wear is going to be strongly non linear. Even if it's not a factor today due to current production tolerances and HVAC, it must become a factor eventually, though maybe not necessarily in our lifetime.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Kind regards<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Paul Wilkins<o:p></o:p></p></div></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><p class=MsoNormal>On Tue, 20 Aug 2019 at 19:59, Peter Betyounan <<a href="mailto:peter.betyounan@serversaustralia.com.au">peter.betyounan@serversaustralia.com.au</a>> wrote:<o:p></o:p></p></div><blockquote style='border:none;border-left:solid #CCCCCC 1.0pt;padding:0cm 0cm 0cm 6.0pt;margin-left:4.8pt;margin-right:0cm'><div><div><div><div><p class=MsoNormal>Easy solution , move to all flash, predicable failures and wear. <o:p></o:p></p></div></div></div><div><p class=MsoNormal><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><blockquote style='margin-top:5.0pt;margin-bottom:5.0pt'><div><p class=MsoNormal>Tue, 20 Aug at 4:07 pm, <<a href="mailto:paulwilkins369@gmail.com">paulwilkins369@gmail.com</a>> wrote:<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><div><p class=MsoNormal><o:p> </o:p></p></div><div><div><div><p class=MsoNormal>Has anyone ever noticed a pattern of disks in equatorial latitudes lasting significantly longer than say Sydney or Melbourne? I notice the Foucault Period for Brisbane is 52hrs vs Melbourne's 39hrs and can't but wonder if this doesn't mean Brisbane based DCs will have their disks last 30% longer, or Darwin x3.<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Kind regards<o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div><div><p class=MsoNormal>Paul Wilkins<o:p></o:p></p></div></div></div></div></div></blockquote></blockquote></div></blockquote></div><div><p class=MsoNormal>_______________________________________________<o:p></o:p></p></div><div><p class=MsoNormal>AusNOG mailing list<o:p></o:p></p></div><div><p class=MsoNormal><a href="mailto:AusNOG@lists.ausnog.net">AusNOG@lists.ausnog.net</a><o:p></o:p></p></div><div><p class=MsoNormal><a href="http://lists.ausnog.net/mailman/listinfo/ausnog">http://lists.ausnog.net/mailman/listinfo/ausnog</a><o:p></o:p></p></div></blockquote></div></div><div><p class=MsoNormal>_______________________________________________<o:p></o:p></p></div><div><p class=MsoNormal>AusNOG mailing list<o:p></o:p></p></div><div><p class=MsoNormal><a href="mailto:AusNOG@lists.ausnog.net">AusNOG@lists.ausnog.net</a><o:p></o:p></p></div><div><p class=MsoNormal><a href="http://lists.ausnog.net/mailman/listinfo/ausnog">http://lists.ausnog.net/mailman/listinfo/ausnog</a><o:p></o:p></p></div></blockquote></div></blockquote></div><div><p class=MsoNormal>_______________________________________________<o:p></o:p></p></div><div><p class=MsoNormal>AusNOG mailing list<o:p></o:p></p></div><div><p class=MsoNormal><a href="mailto:AusNOG@lists.ausnog.net">AusNOG@lists.ausnog.net</a><o:p></o:p></p></div><div><p class=MsoNormal><a href="http://lists.ausnog.net/mailman/listinfo/ausnog">http://lists.ausnog.net/mailman/listinfo/ausnog</a><o:p></o:p></p></div><div><p class=MsoNormal><o:p> </o:p></p></div></blockquote><div><p class=MsoNormal><o:p> </o:p></p></div></div><div id="DAB4FAD8-2DD7-40BB-A1B8-4E2AA1F9FDF2"><br />
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