[Beowulf] Power per area

Scott Atchley e.scott.atchley at gmail.com
Tue Mar 10 13:07:48 PDT 2020

Hi Jeff,

Interesting, I have not seen this yet.

Looking at their 52 kW rack's dimensions, it works out to 3.7 kW/ft^2 for
the enclosure if we do not count the row pitch. If we add 4-5 feet for row
pitch, then it drops to 2.2-2.4 kW/ft^2. Assuming Summit's IBM AC922 nodes
fit and again a row pitch of 4-5 feet, the performance per area would be
31-34 TF/ft^2. Both the performance per area and the power per are are
close to Summit. Their PUE (1.15-1.2) is higher than we get on Summit (1.05
for 9 months and 1.1-1.2 for 3 months). It is very interesting for data
centers that have widely varying loads for adjacent cabinets.


On Tue, Mar 10, 2020 at 3:47 PM Jeff Johnson <jeff.johnson at aeoncomputing.com>

> Scott,
> It's not immersion but it's a different approach to the conventional rack
> cooling approach. It's really cool (literally and figuratively). They're
> based here in San Diego.
> https://ddcontrol.com/
> --Jeff
> On Tue, Mar 10, 2020 at 12:37 PM 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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> --
> ------------------------------
> Jeff Johnson
> Co-Founder
> Aeon Computing
> jeff.johnson at aeoncomputing.com
> www.aeoncomputing.com
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> High-Performance Computing / Lustre Filesystems / Scale-out Storage
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