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<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Hi Damian,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Yep that was the quickest/easiest thing to do – not ideal, but it would keep NextDC happy at least.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US">Keen to hear how other people are solving this problem.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Regards,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif"><o:p> </o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Radek Tkaczyk<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif">Ph: 0413 383 231<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:11.0pt;font-family:"Calibri",sans-serif;mso-fareast-language:EN-US"><o:p> </o:p></span></p>
<p class="MsoNormal"><b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif">From:</span></b><span lang="EN-US" style="font-size:11.0pt;font-family:"Calibri",sans-serif"> Damian Guppy [mailto:the.damo@gmail.com]
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<b>Sent:</b> Friday, 6 November 2015 4:30 PM<br>
<b>To:</b> Radek Tkaczyk <radek@tkaczyk.id.au><br>
<b>Cc:</b> AusNOG Mailing List <ausnog@ausnog.net><br>
<b>Subject:</b> Re: [AusNOG] Airflow for Cisco switches in racks<o:p></o:p></span></p>
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<p class="MsoNormal">If you are mounting your 3750's on the rear posts they wont be deep enough to reach the front, so as long as you blank out the front its just going to exhaust air around your other equipment and the blanking plates should stop most of it
leaking back into the cold isle. <o:p></o:p></p>
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<p class="MsoNormal">--Damian<o:p></o:p></p>
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<p class="MsoNormal">On Fri, Nov 6, 2015 at 10:49 AM, Radek Tkaczyk <<a href="mailto:radek@tkaczyk.id.au" target="_blank">radek@tkaczyk.id.au</a>> wrote:<o:p></o:p></p>
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<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Hi Guys,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We always mount our network switches in our racks with the switches facing the rear, so that when you cable up servers, you don’t have a mess of network cabling going from the front
of the rack to the back of the rack. This has worked well for us for the last 10 years or so, but recently with providers like NextDC doing cold isle containment, this means that switches are blowing hot air into the cold aisle, and some people get unhappy
with this. <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">We use Cisco 3750 switches which are 1RU, and they blow hot air out the back of the switches, some models have side-to-back airflow, but it still results in hot air being sent into
the cold aisle. I have always thought that this amount of hot air was negligible, and wouldn’t even matter in the overall scheme of things, as long as your servers were mounted around the right way.<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">How are other people handling this situation? I’m not really keen on changing our rack standards and having to re-do the entire cabling for racks across the 4 of our data centres
that are using cold isle containment!<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Regards,<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Radek Tkaczyk<o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto">Ph:
<a href="tel:0413%20383%20231" target="_blank">0413 383 231</a><o:p></o:p></p>
<p class="MsoNormal" style="mso-margin-top-alt:auto;mso-margin-bottom-alt:auto"> <o:p></o:p></p>
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