[Beowulf] Power per area

Scott Atchley e.scott.atchley at gmail.com
Wed Mar 11 04:03:50 PDT 2020

Hi Stu,

The rolling weight is only an issue when moving equipment during
installation/removal. It causes point loads and we typically lay steel
plate down to spread the load over multiple tiles.

What is your performance density (FLOPS/ft^2) in Houston if you do not mind
me asking?


On Tue, Mar 10, 2020 at 8:30 PM Stu Midgley <sdm900 at gmail.com> wrote:

> Immersion cooling makes a lot of sense :)
> We run it on the 21st floor of a building in Kuala Lumpur, on the 1st
> floor in Perth and on a slab-on-ground in Houston.
> The tanks+fluid are light.  When full of equipment, about 1.2 tonnes
> spread over about 2m2.
> In Houston, we have the lowest rated raised floor - since the tanks spread
> the load across multiple tiles/floor stands, and there is no rolling weight
> (its spread evenly over 2m2)
> So ~ 2200lbs/10sqft ie. about 220lbs/sqft .  We run a power density of
> 8.5kW/sqm (~800W/sqft) across our whole DC (which includes all the internal
> white space/CRAC space etc).
> We cool the whole facility with evaporation (compressor cooling is only
> for comfort cooling).
> We have hit a PUE of 1.045 in Houston...   and 1.035 in Perth :)
> Come and have a look at our Houston DC :)
> On Wed, Mar 11, 2020 at 3:37 AM Scott Atchley <e.scott.atchley at gmail.com>
> wrote:
>> Hi everyone,
>> I am wondering whether immersion cooling makes sense. We are most limited
>> by datacenter floor space. We can manage to bring in more power (up to 40
>> MW for Frontier) and install more cooling towers (ditto), but we cannot
>> simply add datacenter space. We have asked to build new building and the
>> answer has been consistently "No."
>> Summit is mostly water cooled. Each node has cold plates on the CPUs and
>> GPUs. Fans are needed to cool the memory and power supplies and is captured
>> by rear-door heart exchangers. It occupies roughly 5,600 ft^2. With 200 PF
>> of performance and 14 MW of power, that is 36 TF/ft^2 and 2.5 kW/ft^2.
>> I am wondering what the comparable performance and power is per square
>> foot for the densest, deployed (not theoretical) immersion cooled systems.
>> Any ideas?
>> To make the exercise even more fun, what is the weight per square foot
>> for immersion systems? Our data centers have a limit of 250 or 500
>> pounds per square foot. I expect immersion systems to need higher loadings
>> than that.
>> Thanks,
>> Scott
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> --
> Dr Stuart Midgley
> sdm900 at gmail.com
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