How should each PDU power strip be connected to ensure maximum power redundancy for a rack in a datacenter?

To ensure maximum power redundancy for a rack in a datacenter, connecting each PDU power strip to a different datacenter UPS is the most effective approach. This configuration achieves redundancy by distributing power sources across multiple UPS systems. In the event of a failure in one UPS, the other UPS will continue to supply power, ensuring that the connected equipment remains operational. This setup minimizes the risk of power loss due to a single point of failure, enhancing the reliability and availability of critical systems.

While connecting each PDU to the same floor PDU or the same datacenter UPS may seem like a straightforward solution, it does not provide the same level of protection against power interruptions. If there is an issue with that particular UPS or floor PDU, it could result in downtime for all equipment relying on that unit. By utilizing separate UPS systems, the overall system becomes more resilient, making option D the best choice for maximizing power redundancy in a datacenter environment.