Field Guide · concept

Also known as: Datacenter, Server farm

A data center is a purpose-built facility that houses computing, storage, and networking equipment together with the power, cooling, and connectivity needed to keep it running reliably around the clock.1

rack row rack row COLD aisle cool air up from raised floor HOT aisle HOT aisle Hot-aisle / cold-aisle airflow
Racks face each other across a cold aisle fed by cool air; servers pull that air front-to-back and exhaust into the hot aisles, where the cooling plant captures the heat — the airflow discipline that lets a room pack thousands of machines.

Overview

At its core a data center is a building full of rack servers and the supporting systems that keep them alive: redundant utility feeds and backup generators, uninterruptible power supplies, air or liquid cooling, fire suppression, and high-capacity network links to the outside world. Cabinets are arranged into hot and cold aisles so that cool supply air and hot exhaust never mix, which is the single biggest lever on cooling efficiency.

Facilities are graded by uptime tiers (Tier I–IV) and by energy efficiency, often reported as PUE (power usage effectiveness — total facility power divided by IT power, where 1.0 is the unreachable ideal). Scale ranges from a single server room to hyperscale campuses run by cloud providers and drawing tens of megawatts.

Tiers

The Uptime Institute tier system pins expected availability to how much of the facility is redundant:

Tier Redundancy Approx. uptime Annual downtime
I None (single path) 99.671% ~29 hours
II Redundant components 99.741% ~22 hours
III Concurrently maintainable 99.982% ~1.6 hours
IV Fault tolerant 99.995% ~26 minutes

Higher tiers cost more to build and run, so operators match the tier to how much an outage would actually cost them.

Where it fits

A data center is where most servers actually live. You can put your own hardware in one through colocation, rent capacity inside one as cloud computing, or rely on one indirectly every time you use a web service. The facility’s redundancy is the foundation of high availability. In GopherTrunk terms a data center is fine for storing and serving decoded calls, but the RF capture still happens at the antenna — the radio front end cannot move into the building.

Sources

  1. Data center — Wikipedia, on data center facilities, tiers, PUE, and airflow. ↩

See also