NC Nov-Dec 2023

OPINION: DATA CENTRES
Hot and Cold Aisles in a Data Centre
supplies offer a lower efficiency of 92%.
The efficiency of a power supply isn't linear
or flat when it comes to the supply's output
range. Most power supplies operate at
their maximum efficiency when running in
the upper ranges of their rated capacity.
This means that an 800-watt power supply
providing 400 watts of power (50%
capacity) will be less efficient than a 500-
watt power supply providing that same 400
watts of output power (80% capacity).
SOURCE GREEN ENERGY
A data centre's energy source has the
most significant impact on its carbon
footprint and poses the most substantial
opportunity to benefit the environment.
Renewable energy programmes for
commercial customers include generation
through utility, third-party power
purchase agreements (PPA), or renewable
energy credits (REC). Distributed
renewable energy production owned or
controlled by data centres is optimal. But
on-site renewable energy sources do not
always satisfy data centre energy
demands. Fortunately, clean grid energy
can augment this. There are also
increasingly effective energy storage
solutions for deployment on-site, coming
down in cost as battery technology
improves and scales.
RETHINK SITE SELECTION CRITERIA
Large-scale data centres cost a lot of
money to operate. For example, a single
hyper-scale data centre can demand 100
MW of power to keep servers, storage,
and networking infrastructure performing
as expected (enough to power 80,000 US
households). In addition, while electronics
use most of the energy consumed in a
data centre, cooling those electronics to
maintain operating temperatures can
consume 40% of facility energy.
Building costs consist of the land value
as well as the cost of construction.
Construction prices vary depending on the
geography or region. Unlike building a
home or an office building, a data
centre's location has some unique
requirements to be considered "green"
and deliver agreed-upon Service Level
Agreements (SLAs). Factors such as
climate, energy pricing, risk of natural
disasters, water costs, and the cost of
network bandwidth all contribute to the
choice of data centre locations.
Data centres are critical to the world's
economy. Many aspects of modern life
depend on them, which consumes more
electricity than ever before to deliver the
services everyone uses. While the work per
watt of the CPU continues to increase,
there is a need to reduce the overall data
centre power consumption.
There are several actions that data centre
operators can take. These include running
systems at warmer temperatures,
configuring the data centre with hot and
cold aisles, and sourcing green energy.
Data centres can reduce their PUE by
taking just a few steps, lowering their
operating expenses and decreasing their
CO2 footprint for years to come. NC
22 NETWORKcomputing NOVEMBER/DECEMBER 2023 @NCMagAndAwards
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