A data center is more than a room full of servers.
Servers process requests, storage systems retain data, networks connect equipment and users, power systems support continuous operation, and cooling controls the heat produced by IT hardware.
Data center fundamentals series
A data center is a facility for running digital services
A data center is a physical room, building, or facility that houses the IT infrastructure used to build, run, and deliver applications and services. It also stores and manages the data associated with those services.
That is why a server alone is not enough. To provide a service, a server needs data to work with, a path to communicate with other equipment and users, electrical power, and an environment that keeps its hardware within an appropriate operating temperature range.
The Fiber Optic Association — The FOA Reference For Fiber Optics - Fiber Optic Network Design
IBM — What Is a Data Center? | IBM
Servers: computers that process service requests
Servers are computers that deliver applications, services, and data to end-user devices. A server may, for example, process a request for a web page, run part of a business application, or return a requested file.
When someone uses a service from a laptop or phone, their request travels through a network to a server. The server processes the request and sends the needed result or data back through the network.
Storage systems: where service data is kept
Storage systems retain the data that servers need to process and the information needed to operate a service. Storage can be arranged in several ways.
- Direct-attached storage (DAS) is storage connected close to a particular server.
- Network-attached storage (NAS) provides storage and data access to multiple servers over a standard Ethernet connection.
- A storage area network (SAN) provides shared storage through a separate network for data.
A single data center can use DAS, NAS, and SAN together. The suitable arrangement depends on how systems need to access and share data; these are examples of possible configurations, not a required layout for every facility.
Networks and cabling: the paths between systems and users
The data center network carries traffic between servers, between servers and storage, and between servers and clients. It can include switches, routers, fiber connections, and the links that connect the equipment.
Short copper links and fiber links can both be used within a data center. The cables matter, but the network is more than cabling: the physical connections and the paths traffic follows are also part of the design.
Power systems, UPS units, and generators: support through power disturbances
Servers, storage systems, and network equipment need electricity to continue operating. Data centers therefore need power distribution as well as equipment intended to address power problems.
Many servers have dual power supplies. Battery-powered uninterruptible power supplies (UPS units) can protect against power surges and brief outages. If an outage is more severe, generators can be brought into service. These measures are not an identical mandatory checklist for every data center; the actual design depends on the facility and its operating requirements.
Cooling and environmental control: managing IT equipment heat
Servers and other IT hardware produce heat while operating. Cooling and environmental-control systems help keep that equipment within proper temperature ranges.
Air cooling can serve an entire server room or target particular rows or racks. Liquid-cooling examples include pumping liquid directly to processors or immersing servers in coolant. The methods differ, but their common purpose is to control the heat produced by the equipment.
The complete flow: process, store, connect, power, and cool
These systems work together rather than as separate collections of equipment. Servers process requests, storage systems hold needed data, and networks carry requests and results. Power systems help the equipment remain operational, while cooling manages the heat created during that work.
A data center is therefore better understood as a combination of IT equipment and supporting facility systems that enable digital services to operate.
Sources
- IBM — What Is a Data Center? | IBM
- The Fiber Optic Association — The FOA Reference For Fiber Optics - Fiber Optic Network Design
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