Diff: Data Centre

A '''data centre''' is a facility used to house computing, storage, and networking equipment. Data centres support websites, cloud services, business systems, communication platforms, backups, streaming, AI workloads, financial systems, public-sector services, and many other digital operations.

A data centre is more than a room full of servers. It is a controlled technical environment built around power, cooling, network connectivity, physical security, monitoring, fire protection, maintenance, and resilience.

== Purpose ==

Data centres exist because modern digital services need reliable places to run hardware. A single server may be enough for a small task, but larger services need racks of equipment, redundant power, fast network connections, spare capacity, and staff who can maintain the environment.

They are used by cloud providers, hosting companies, banks, public bodies, universities, hospitals, media companies, games services, software companies, and organisations that keep critical systems under their own control.

== Core Infrastructure ==

Common data-centre infrastructure includes:

* Server racks and cabinets.

* Compute servers, storage systems, and network switches.

* Routers, firewalls, load balancers, and cross-connects.

* Uninterruptible power supplies and battery systems.

* Backup generators or other reserve power arrangements.

* Cooling systems and airflow management.

* Fire detection and suppression.

* Physical access controls, CCTV, visitor controls, and secure loading areas.

* Monitoring systems for power, temperature, humidity, network status, and equipment faults.

The aim is to keep systems available while allowing maintenance, upgrades, and fault handling.

== Resilience ==

Resilience is a major design concern. Data centres often use redundant power feeds, duplicate network paths, spare cooling capacity, and backup systems so that one fault does not shut down the whole facility.

Resilience can exist inside one site, between rooms in the same site, or across separate sites. Critical services may run from multiple regions or facilities so they can survive local failures.

The exact level of resilience depends on the business need and budget. A test environment does not need the same design as a payment system, emergency service, or national platform.

== Connectivity ==

Network connectivity is one of the main reasons to use a professional data centre. Facilities often connect to multiple carriers, internet exchanges, cloud providers, and private networks. This allows customers to choose routes, reduce latency, and build private links between systems.

Cross-connects inside the building can link a customer's rack to carriers, cloud on-ramps, or other tenants. That makes the facility part of a wider digital supply chain rather than just a physical hosting room.

Physical security protects the equipment and the data stored or processed on it. A serious facility normally controls who can enter the building, which rooms they can access, and what they can remove. Cabinets, cages, visitor logs, card access, biometrics, cameras, and staff procedures may all be part of the security model.

Physical security does not replace software security. A well-run data centre can still host badly configured systems. Customers remain responsible for operating systems, applications, access controls, backups, and encryption unless those duties are clearly handled by a managed service.

== Energy and Cooling ==

Data centres use significant electricity because servers consume power and generate heat. Cooling design, airflow management, server efficiency, power distribution, and workload placement all affect operating costs and environmental impact.

The UK government has examined how growth in digital services and data centres affects energy consumption. Planning, grid capacity, heat reuse, water use, and efficiency are therefore public-policy issues as well as engineering issues.

== Cloud and Hosting ==

Cloud computing depends on data centres, even when customers never see the hardware. A virtual machine, storage bucket, database, or managed application still runs on physical systems in a facility somewhere.

Traditional hosting, colocation, private cloud, public cloud, and edge computing all use data-centre principles. The difference is who owns the hardware, who manages it, how customers pay, and how much control they have.

== UK Public Sector Example ==

The UK Crown Hosting Data Centres framework shows how public-sector hosting can be treated as a shared infrastructure service. The framework is available to central government departments, arm's-length bodies, and the wider public sector, and covers matters such as security, connectivity, service-level agreements, quality, and environmental standards.

* [[Cloud Computing]]

* [[Domain name system]]

* [https://www.gov.uk/government/publications/impact-of-growth-of-data-centres-on-energy-consumption GOV.UK: impact of growth of data centres on energy consumption]

* [https://www.gov.uk/guidance/the-crown-hosting-data-centres-framework-on-the-digital-marketplace GOV.UK: Crown Hosting Data Centres framework]

* [https://csrc.nist.gov/pubs/sp/800/145/final NIST SP 800-145: The NIST Definition of Cloud Computing]

[[Category:Computing]]

[[Category:Infrastructure]]