Routers in Data Centers

Seth Mattinen sethm at
Sun Sep 26 19:17:14 UTC 2010

On 9/26/10 11:09 AM, Joel Jaeggli wrote:
> Joel's widget number 2
> On Sep 26, 2010, at 10:47, Chris Adams <cmadams at> wrote:
>> Once upon a time, Joel Jaeggli <joelja at> said:
>>> On Sep 26, 2010, at 8:26, Chris Adams <cmadams at> wrote:
>>>> There are servers and storage arrays that have a front that is nothing
>>>> but hot-swap hard drive bays (plugged into backplanes), and they've been
>>>> doing front-to-back cooling since day one.  Maybe the router vendors
>>>> need to buy a Dell, open the case, and take a look.
>>> The backplane for a sata disk array is 8 wires per drive plus a common power bus.
>> Server vendors managed cooling just fine for years with 80 pin SCA
>> connectors.  Hard drives are also harder to cool, as they are a solid
>> block, filling the space, unlike a card of chips.
> It's the same 80 wires on every single drive in the string.
> There are fewer conductors embedded in 12 drive sca backplane as there are in a 12 drive sata backplane, in both cases they are generally two layer pcbs. Compared to what 10+ layer pcbs that are a approaching 1/4" thick on the router. 

Aw come on, that's no reason you can't just drill it full of holes. I
mean, it is 2010. It should be wireless by now.


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