Most data center risk discussions focus on visible threats like drone strikes, storms, and power failures. But according to Data Center Knowledge, an invisible force also poses a serious risk to uptime: electromagnetic interference (EMI).
EMI arises from electric or magnetic fields generated by natural and human-made sources, including solar activity, lightning, radio and cellular transmitters, switching power supplies, and even LED drivers. When this ambient energy couples into servers, networking hardware, or power circuits, it can disrupt signals and power quality, leading to data errors, intermittent or cascading outages, power anomalies, and in severe cases, hardware damage.
Why the Risk Is Growing
EMI has existed since the early days of digital electronics, but several trends are intensifying the risk. Ubiquitous wireless networks create a constant background of radio-frequency energy, and the rollout of higher-power, higher-density 5G infrastructure adds further baseline interference.
Data centers themselves also generate EMI. High-density IT equipment, switching power supplies, and power distribution gear are all potential emission sources. As facilities are increasingly built in clusters, each site risks becoming a source of interference for its neighbors, and even for its own systems if shielding and isolation are inadequate.
There is also the possibility of deliberate disruption. The Uptime Institute has noted that many operators have historically underestimated electromagnetic pulse (EMP), an extreme, fast-transient form of electromagnetic disturbance, in their risk assessments, leaving gaps in protective measures. While EMP differs from everyday EMI, it highlights broader preparedness shortfalls for electromagnetic threats generally.
Mitigation Strategies
Effective defenses exist. Shielding is the primary approach: lining server rooms or entire facilities with conductive materials such as aluminum can create a Faraday-cage effect that blocks most external electromagnetic energy. EMI-resistant gaskets around cabinet doors and cable penetrations help prevent leakage paths.
Power systems need separate attention since EMI can propagate through electrical circuits. Uninterruptible power supplies with built-in EMI/RFI filtering reduce conducted noise before it reaches sensitive equipment, while robust, low-impedance grounding and bonding provide a safe path for induced currents.
- Organize and segregate power and data cabling to minimize crosstalk
- Avoid tight bend radii and use proper cable termination
- Choose sites away from strong emitters like cellular towers and high-voltage lines
- Maintain clear zones and strong physical security to prevent attackers from placing EMI-emitting devices nearby
Completely eliminating EMI is rarely possible, but as digital infrastructure grows denser and wireless activity increases, operators are being urged to treat shielding, filtering, grounding, cable discipline, and site selection as standard components of their uptime strategy.