Which factor is crucial for maintaining server redundancy in a data center?

Employing dual Power Distribution Units (PDUs) is crucial for maintaining server redundancy in a data center because it ensures that there is a backup power source available in case one PDU fails. Redundancy is a fundamental aspect of data center operations, as it helps minimize downtime and maintain availability. By using dual PDUs, a data center can distribute power from two separate sources, which protects against power loss caused by equipment failure or power supply issues.

If one PDU were to fail, the other can continue to supply power to the servers, thus avoiding disruptions in service. This configuration is often part of a larger strategy that includes redundant power supplies within servers and other components, ultimately enhancing the overall resilience of the data center's infrastructure.