Re: Effects of Cold Front on Internet Infrastructure - U.S. Midwest

[Paul Zugnoni via NANOG <nanog () nanog org>]

And apparently fire. I wasn’t going to chime in but one of my providers
*just* alerted us to an electrical fire in a Minneapolis pop causing loads
to failover to ups. Unknown whether weather conditions contributed to the
incident. PZ

On Wed, Jan 30, 2019 at 09:25 Naslund, Steve <SNaslund () medline com> wrote:

> > To the 'infrastructure' question, I think the biggest concerns would >be
> power related. Although we have a DC in Buffalo that is cooled >on
> ambient outside air that has the opposite problem ; it's TOO cold >at the
> moment, so we are cycling most of the hot server exhaust >back into the
> computer rooms to maintain temperatures.
>
>
>
> Exactly what he said.  We actually run cooling and supplemental heating in
> extreme cold.  We need to keep the chiller pulling heat into itself and
> pumps moving on high to keep the outdoor components from freezing up.
> During the summer you might run close to or slightly below freezing on the
> coolant loops but in these conditions you cannot run that low a temp
> because things will freeze up before the coolant returns.  We also have to
> keep the room reasonably warm (50F +).  You also need to watch out for fast
> temp excursions to keep humidity under control.
>
>
>
> The wind speed does make some difference since it is like a fan on your
> evaporator pulling heat out of the cooling loops faster than still air will.
>
>
>
> Steven Naslund
>
> Chicago IL
-- 
PZ
Head of Datacenter and Network Infrastructure, Wish
pz () wish com +1-650-313-3458