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Lexicon for Data Centres

Power Distribution Centre (PDC)

A Power Distribution Centre (PDC) is a centralized unit in a data centre that manages and distributes electrical power from utility feeds or backup generators to PDUs and IT equipment. PDCs include transformers, circuit breakers, and monitoring tools to regulate and protect the electrical infrastructure. They are designed to handle high loads, provide redundancy, and ensure a steady power supply to critical systems. Effective PDC management is crucial for preventing downtime and maintaining the reliability of data centre operations.

How does a PDC differ from a PDU?

A PDC distributes power at a larger scale, feeding multiple PDUs, while a PDU distributes power within server racks.

Why is PDC redundancy critical?

Redundancy in PDCs ensures power availability during equipment failures or maintenance activities.

How is a PDC integrated into a data centre’s power system?

It connects utility feeds, backup power sources, and distribution networks, ensuring reliable power delivery.

Related Terms

Big Data

Big data refers to large, complex datasets that traditional data processing methods cannot effectively handle. The defining characteristics of big data are often described by the “3 Vs”: Volume (the amount of data), Velocity (the speed at which data is generated and processed), and Variety (the diverse formats and sources of data). Big data analytics involves extracting meaningful insights using advanced tools and techniques such as machine learning, data mining, and artificial intelligence. It is used in various industries for applications like predictive analytics, customer behavior analysis, and operational optimisation. Big data is critical for driving innovation and decision-making in a data-driven world.

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Cloud Computing

Cloud computing refers to the delivery of IT services, including storage, computing power, and applications, over the internet. Rather than owning and maintaining physical servers or data centers, organisations can rent access to a range of services from cloud providers. Key features of cloud computing include scalability, flexibility, cost efficiency, and global access. Cloud computing is broadly categorised into three service models: Infrastructure as a Service (IaaS), Platform as a Service (PaaS), and Software as a Service (SaaS). It is the foundation for modern IT architectures, supporting hybrid, public, and private cloud deployments.

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Tier 2 Data Centre

A Tier 2 data centre builds upon the foundation of Tier 1 by incorporating partial redundancy for power and cooling systems, reducing the likelihood of service interruptions. These facilities guarantee a 99.741% uptime, which translates to about 22 hours of annual downtime. While they provide improved reliability over Tier 1, they are still not fully fault-tolerant and are unsuitable for mission-critical applications. Tier 2 data centres cater to businesses that need moderate reliability but are not ready to invest in higher-tiered infrastructure.

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