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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='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>Usually takes a major outage before many businesses see the value of redundancy.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>A good example of this: a site (which hosts a lot of services for other offices) is fed by a microwave link to a nearby datacentre (no glass in the ground at the time, and the build cost was going to be too high). This all worked well until lightning struck the antenna and left a blob of blackened plastic at the top of the mast. It took us about 12 hours to get it back online (had to get a new radio, config it, wait for a big enough gap in the storm to send someone up onto the roof). The total cost of downtime was astronomical (and, of course, something we’d been warning the business about for a long time).<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>The next day, we had signed approval to bring in an additional link, set up BGP, buy new routers to support it etc etc and a directive to “make sure this never happens again”.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'>The probability of an outage is 100% - from backhoe related signal attenuation to a tech entering the wrong command on the wrong router. The only difference is how long the outage lasts.<o:p></o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><span style='font-size:10.0pt;font-family:"Arial","sans-serif";color:#1F497D'><o:p> </o:p></span></p><p class=MsoNormal><b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'>From:</span></b><span lang=EN-US style='font-size:10.0pt;font-family:"Tahoma","sans-serif"'> ausnog-bounces@lists.ausnog.net [mailto:ausnog-bounces@lists.ausnog.net] <b>On Behalf Of </b>Paul Wilkins<br><b>Sent:</b> Wednesday, 4 July 2012 10:10 PM<br><b>To:</b> ausnog@lists.ausnog.net<br><b>Subject:</b> Re: [AusNOG] AAPT Ethernet outage<o:p></o:p></span></p><p class=MsoNormal><o:p> </o:p></p><p class=MsoNormal style='margin-bottom:12.0pt'>It's not a complicated calculation...<br><br>Productivity Value (Expected time to recover) * Probability of outage vs Cost of providing redundancy<br><br>Paul WIlkins<span style='color:#1F497D'><o:p></o:p></span></p></div></body></html>