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I front-mount my switches and accept that I need to allow for a
front-to-back cable path for my servers. In a rack with mixed
gear-types it isn't that much of a drama because usually there's an
available path for the purpose. If done with decent cable
management it also 'looks the part' - there are some quite good
cable-management bars that have 'brushed' penetrations that allow
you to pass cabling through to the rear of the rackspace in an
organised and tidy fashion.<br>
<br>
As a datacentre operator (with cold-isle containment) nothing
exasperates me more than seeing equipment mounted incorrectly - but
we havn't policed this too zealously. Yet. The bigger battle to
fight is the one around ensuring customers fill in their blanks when
they remove equipment!<br>
<br>
Mark.<br>
<br>
<br>
<div class="moz-cite-prefix">On 6/11/2015 7:36 p.m., Radek Tkaczyk
wrote:<br>
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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
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US">From:</span></b><span
style="font-size:11.0pt;font-family:"Calibri",sans-serif"
lang="EN-US"> Damian Guppy [<a class="moz-txt-link-freetext" href="mailto:the.damo@gmail.com">mailto:the.damo@gmail.com</a>]
<br>
<b>Sent:</b> Friday, 6 November 2015 4:30 PM<br>
<b>To:</b> Radek Tkaczyk <a class="moz-txt-link-rfc2396E" href="mailto:radek@tkaczyk.id.au"><radek@tkaczyk.id.au></a><br>
<b>Cc:</b> AusNOG Mailing List <a class="moz-txt-link-rfc2396E" href="mailto:ausnog@ausnog.net"><ausnog@ausnog.net></a><br>
<b>Subject:</b> Re: [AusNOG] Airflow for Cisco switches in
racks<o:p></o:p></span></p>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<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>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
</div>
<div>
<p class="MsoNormal">--Damian<o:p></o:p></p>
</div>
</div>
<div>
<p class="MsoNormal"><o:p> </o:p></p>
<div>
<p class="MsoNormal">On Fri, Nov 6, 2015 at 10:49 AM, Radek
Tkaczyk <<a moz-do-not-send="true"
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 moz-do-not-send="true"
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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