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<body>Hey James,
<br />
<br />
We do something similar and have found that if you mount the switches in the middle of the racks at the back – at least with the APC PDUs we use there is nothing in the way – tend to mount them where the screen is on the rails. Just enough room for 3 switches there.
<br />
<br />
Top switch for servers in the top half, middle switch for IPMI / drac and the bottom switch for the servers in the bottom half. It works quite well, the cabling is nice and neat and doesn’t get in the way of anything.
<br />
<br />
Regards,
<br />
Nick
<br />
<br />
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On 29/8/17, 9:11 am, "AusNOG on behalf of Peter Tiggerdine" <ausnog-bounces@lists.ausnog.net on behalf of ptiggerdine@gmail.com> wrote:
<br />
<br />
Depends on the way the fans spins and what's best for thermal dynamics.
<br />
<br />
Some of the Cisco, juniper and Brocade kit you can get fans that spin
<br />
in either direction. if so then I tend to put ports in the cold isle
<br />
and suck the air through the switch by preference. This is largely to
<br />
carter for hot SFP's like QSFP's, XENpacks etc.. and the like. Also
<br />
working in the cold isle tends to be easier.
<br />
<br />
Cables passing through the racks isn't a bad thing as long as rack
<br />
dimensions carter for it (yes Fuj I'm looking at you >:( ).
<br />
<br />
Regards,
<br />
<br />
Peter Tiggerdine
<br />
<br />
GPG Fingerprint: 2A3F EA19 F6C2 93C1 411D 5AB2 D5A8 E8A8 0E74 6127
<br />
<br />
<br />
On Tue, Aug 29, 2017 at 9:02 AM, James Cunningham <jjazza26@gmail.com> wrote:
<br />
> Hi Guys,
<br />
>
<br />
> This is an age old discussion that I have had with many people over the
<br />
> years, but am keen to find out what other people think about installing
<br />
> switches into data centre racks.
<br />
>
<br />
> Say for example you have 4 network switches to install into a rack (standard
<br />
> 600mm rack), along with 20-30 1RU and 2RU servers.
<br />
>
<br />
> Would you install the switches facing forwards, or install the switches
<br />
> facing backwards?
<br />
>
<br />
> The way I see it, there are various pros and cons of each approach:
<br />
>
<br />
> FORWARD FACING
<br />
> PROS
<br />
> Easy to install and remove the switch from the front of the rack, as power
<br />
> cords are not in the way
<br />
> Most switches expect this installation for air flow, but some switches do
<br />
> have reversible fans.
<br />
>
<br />
> CONS
<br />
> You must route the cables from the front of the rack, to the back of the
<br />
> rack where the server network ports are, leading to cable clutter within the
<br />
> rack.
<br />
>
<br />
> REAR FACING
<br />
> PROS
<br />
> Cable distance and cable mess going from the switches to the servers is alot
<br />
> less.
<br />
>
<br />
> CONS
<br />
> When it comes to removing the switch, it's very difficult with a fully
<br />
> loaded rack, as the power cables tend to get in the way from the vertical
<br />
> PDUs at the back.
<br />
>
<br />
> Has anyone else had some detailed thoughts about the best way to rack mount
<br />
> data centre network switches?
<br />
>
<br />
> Thanks in advance.
<br />
>
<br />
> James
<br />
>
<br />
>
<br />
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> AusNOG@lists.ausnog.net
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>
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