Data Center Sizes: What You Need to Know
Not all data centers are created equal. The difference between a small site set up at the base of a cell tower and a digital facility spanning several hectares dedicated to AI is not just a matter of square footage—it’s a matter of purpose. The data center's size directly determines what it can host, the types of applications it can support, the power density it can handle, and the connectivity constraints it can accommodate. Understanding these differences means picking the right infrastructure for the specific need.
The current market is structured around two complementary models. On one hand, hyperscale data centers—true digital powerhouses—scaled to meet the growing demands of Artificial Intelligence (AI) and the public cloud. On the other, more compact and distributed structures, designed to meet an urgent need for proximity, low latency, and sovereignty. Each format caters to distinct business applications: the challenge for IT decision-makers is to identify which one aligns with their intended use.
Physical dimensions
The floor space of a data center is a misleading metric if it is not considered alongside its critical power. Historically, the largest data center was the one with the most kilometers of aisles. Today, the focus is on optimizing the space actually used for IT infrastructure—what operators call the “clean room” or “white space,” meaning the area dedicated to server racks, as distinct from technical spaces (cooling units, UPS systems, transformers).
In France, the total IT floor space is around 465,000 m², but this footprint masks a striking lack of uniformity.
A 1,000-square-meter data center can be more efficient than a facility ten times its size if its design optimizes airflow, cooling, and power distribution. The building is merely a shell. What matters is what’s inside.
Several categories are generally identified:
• micro data centers, sometimes limited to a single rack;
• neighborhood data centers, generally under 500 m²;
• enterprise infrastructures, spanning several thousand m²;
• hyperscale data centers, which exceed 10,000 m² and operate as true digital factories.
This diversity reflects a rapidly evolving market. Growth is now driving an increase in more compact locations that are closer to end-users.
Storage capacity and density
The revolution is no longer about expanding physical space, but about increasing rack density. Power density is the industry’s new standard.
Server density
We are moving from an era of low density (3 to 5 kW per rack) to an era of high intensity. With the boom in AI, equipment must handle loads sometimes exceeding 50 kW per rack—equivalent to the annual electricity consumption of about ten French households concentrated in a single cabinet with a floor area of one square meter. On the scale of a data center spanning a few hundred square meters, we are now talking about several megawatts—equivalent to the consumption of a town with several thousand residents. This shift is forcing us to rethink the very design of power distribution components. A 100-square-meter data center today can house the computing power that would have required 1,000 square meters ten years ago.
Total storage capacity
The global volume of stored data is exploding, but data management is becoming more selective. “Cold” storage (archives) is well suited to massive off-site facilities, while “hot” storage, required for real-time applications, demands responsive infrastructure. Every square meter of a data center now concentrates an unprecedented density of energy: it is a technological profit center that must be powered and protected without failure.
Localisation and infrastructure
This unprecedented concentration of energy makes the location choice all the more strategic. Beyond logistics, location is a matter of physics: light travels fast, but not instantly.
Which location should you choose?
The location choice depends on latency tolerance. For a connected vehicle or a mission-critical healthcare application, every millisecond counts. This is where the concept of the Edge data center comes into its own. By placing the infrastructure as close as possible to the user, we avoid the bottlenecks of central networks. UltraEdge, born from the transformation of SFR’s infrastructure, occupies strategic locations that are impossible to replicate today, offering immediate connectivity in the heart of cities.
Network Connectivity
A data center is a data hub. The quality of its “docks” (fiber connections) is just as important as the size of its “warehouses.” UltraEdge’s 7 IX data centers (including those in Aubervilliers, Lyon, and Marseille) are peering points where more than 50 operators converge. This neutrality is crucial: it allows companies to avoid being locked into a single provider and to optimize their traffic to the public or private cloud.
Comparing Locations: Hubs vs. Edge
Choosing a location is also a matter of applied physics. Here’s how to compare solutions based on your actual objectives:
1. « Hyperscale » Hubs
This is where submarine cables and internet backbones converge.
• The asset: Unlimited connectivity. These are “peering points” where massive amounts of data are exchanged with the rest of the world.
• The use case: Ideal for “cold” storage (archives), big data, or training heavy AI models.
• The limitation: Energy concentration that causes cooling issues and urban electrical grid saturation.
2. The « Edge » or Proximity
This is the strategy advocated by UltraEdge, which prioritizes decentralization over centralization.
• The asset: Ultra-low latency. By placing the server as close as possible to the user (the “edge” of the network), we eliminate micro-delays in data transmission.
• The use case: Critical for connected vehicles, telemedicine, or industrial cybersecurity, where every millisecond of response time counts.
• The added value: Sovereignty. Data remains within a specific territory, under French jurisdiction, far from the risk of legal ambiguity posed by transcontinental giants.
Why is this distinction critical for you?
If your IT project is global and asynchronous (email, mass storage), location doesn’t matter: focus on price and performance.
But if your project is interactive, sensitive, or regulated (HDS health data, real-time), location becomes your first tech defense.
UltraEdge Data Centers Tailored to IT Projects
UltraEdge’s approach is that of a distributed and sovereign infrastructure. Here are some figures to illustrate this:
With 250 sites, including 84 local data centers and 7 hyper-connected IX data centers (such as the recently opened Datapole in Bordeaux), the hosting provider offers a concrete alternative to the all-hyperscale model. Here, growth does not come at the expense of human touch. Over 300 expert technicians oversee ISO 27001- and HDS-certified facilities, ensuring that your healthcare data or trade secrets remain under French jurisdiction, in full compliance with the GDPR.
Availability, as defined by the EN 50600-1 standard, is our guiding principle. Whether you need Tier III-level infrastructure for your standard projects or enhanced redundancy, our network offers the flexibility required for an ideal solution. By revitalizing existing infrastructure to bring it up to the highest current standards, UltraEdge proves that the best data center size is the one that adapts to your region, without ever sacrificing performance for the sake of excess.