[Gllug] Bring Your Own Server

[salsaman at xs4all.nl]

On Sun, June 12, 2011 23:06, John Hearns wrote:
> Regarding water cooling,
> for hight density blade servers - ie high performance clusters etc. it
> is also feasible to use water-cooled rack doors. Instead of using a
> chilled water supply to cool air conditioning units, what you do is
> have racks which have high-airflor fans which blow to the rear of the
> rack. the rear rack doors have cooling units which are fed by the
> cooled water. Think reverse radiators - each unit has a cool water
> inlet and a hot water outlet. Units like this can in fact result in a
> net cooling of a computer room.
>
> Cooling via river water might not be such a bad idea - you would not
> use the river water iteself directly - what you do is circulate the
> water via a heat exchanger and use the cooled water for your servers,
> and reject the heat into the river.
>
> I happen to run some systems which use water cooled racks like this -
> thought not rejecting the heat to a local river I hasten to add.
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>



Another thing to be aware of:

heat + water => humidity.

I have had a machine here in Brazil break its motherboard simply by being
left unused for one month and then powered up.

When planning an installation in humid conditions, consider storing any
unused equipment in plastic bags or sealed containers. It will save a lot
of expense. Powered up equipment should be OK due to the drying effect of
heat it generates.


Salsaman.






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