<div dir="ltr"><div>I suppose an option is to make sure the front of the rack has full blaking plates for free RU's at the front. This should prevent the majority of hot air from shooting out the front of the rack.<br><br></div>Ben<br><div><br><div class="gmail_quote"><div dir="ltr">On Fri, Nov 6, 2015 at 2:03 PM Radek Tkaczyk <<a href="mailto:radek@tkaczyk.id.au">radek@tkaczyk.id.au</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex">
<div bgcolor="white" link="#0563C1" vlink="#954F72" lang="EN-AU">
<div>
<p class="MsoNormal"><span style="color:windowtext">Yep I have seen that, but that option doesn’t exist on the Catalyst 3750.<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:windowtext"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:windowtext">Looking around at the Racks at NextDC M1, S1, B1, etc, I can see that many other racks have the same Cisco 3750 switches, and are installed reverse as well.<u></u><u></u></span></p></div></div><div bgcolor="white" link="#0563C1" vlink="#954F72" lang="EN-AU"><div>
<p class="MsoNormal"><span style="color:windowtext"><u></u> <u></u></span></p>
<div>
<p class="MsoNormal"><span style="color:windowtext">Regards,<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:windowtext"><u></u> <u></u></span></p>
<p class="MsoNormal"><span style="color:windowtext">Radek Tkaczyk<u></u><u></u></span></p>
<p class="MsoNormal"><span style="color:windowtext">Ph: 0413 383 231<u></u><u></u></span></p>
</div>
<p class="MsoNormal"><span style="color:windowtext"><u></u> <u></u></span></p>
</div></div><div bgcolor="white" link="#0563C1" vlink="#954F72" lang="EN-AU"><div><div>
<div style="border:none;border-top:solid #e1e1e1 1.0pt;padding:3.0pt 0cm 0cm 0cm">
<p class="MsoNormal"><b><span style="color:windowtext" lang="EN-US">From:</span></b><span style="color:windowtext" lang="EN-US"> AusNOG [mailto:<a href="mailto:ausnog-bounces@lists.ausnog.net" target="_blank">ausnog-bounces@lists.ausnog.net</a>]
<b>On Behalf Of </b>Joseph Goldman<br>
<b>Sent:</b> Friday, 6 November 2015 12:58 PM<br>
<b>To:</b> <a href="mailto:ausnog@lists.ausnog.net" target="_blank">ausnog@lists.ausnog.net</a><br>
<b>Subject:</b> Re: [AusNOG] Airflow for Cisco switches in racks<u></u><u></u></span></p>
</div>
</div></div></div><div bgcolor="white" link="#0563C1" vlink="#954F72" lang="EN-AU"><div>
<p class="MsoNormal"><u></u> <u></u></p>
<p class="MsoNormal" style="margin-bottom:12.0pt">Certain cisco switch models (like the Nexus 2000 at a quick google, possibly others) offer to order them with reversed airflow for this reason I believe.<span style="font-size:12.0pt"><u></u><u></u></span></p>
<div>
<p class="MsoNormal">On 06/11/15 13:49, Radek Tkaczyk wrote:<u></u><u></u></p>
</div>
<blockquote style="margin-top:5.0pt;margin-bottom:5.0pt">
<p class="MsoNormal">Hi Guys,<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">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.
<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">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.<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal">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!<u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span>Regards,</span><u></u><u></u></p>
<p class="MsoNormal"><span> </span><u></u><u></u></p>
<p class="MsoNormal"><span>Radek Tkaczyk</span><u></u><u></u></p>
<p class="MsoNormal"><span>Ph: 0413 383 231</span><u></u><u></u></p>
<p class="MsoNormal"> <u></u><u></u></p>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><br>
<br>
<br>
<u></u><u></u></span></p>
<pre>_______________________________________________<u></u><u></u></pre>
<pre>AusNOG mailing list<u></u><u></u></pre>
<pre><a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><u></u><u></u></pre>
<pre><a href="http://lists.ausnog.net/mailman/listinfo/ausnog" target="_blank">http://lists.ausnog.net/mailman/listinfo/ausnog</a><u></u><u></u></pre>
</blockquote>
<p class="MsoNormal"><span style="font-size:12.0pt;font-family:"Times New Roman",serif"><u></u> <u></u></span></p>
</div></div>
_______________________________________________<br>
AusNOG mailing list<br>
<a href="mailto:AusNOG@lists.ausnog.net" target="_blank">AusNOG@lists.ausnog.net</a><br>
<a href="http://lists.ausnog.net/mailman/listinfo/ausnog" rel="noreferrer" target="_blank">http://lists.ausnog.net/mailman/listinfo/ausnog</a><br>
</blockquote></div></div></div>