[AusNOG] Airflow for Cisco switches in racks

[Radek Tkaczyk]

Hi Damian,

Yep that was the quickest/easiest thing to do – not ideal, but it would keep NextDC happy at least.

Keen to hear how other people are solving this problem.

Regards,

Radek Tkaczyk
Ph: 0413 383 231

From: Damian Guppy [mailto:the.damo at gmail.com]
Sent: Friday, 6 November 2015 4:30 PM
To: Radek Tkaczyk <radek at tkaczyk.id.au>
Cc: AusNOG Mailing List <ausnog at ausnog.net>
Subject: Re: [AusNOG] Airflow for Cisco switches in racks

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.

--Damian

On Fri, Nov 6, 2015 at 10:49 AM, Radek Tkaczyk <radek at tkaczyk.id.au<mailto:radek at tkaczyk.id.au>> wrote:
Hi Guys,

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.

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.

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!

Regards,

Radek Tkaczyk
Ph: 0413 383 231<tel:0413%20383%20231>


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