In a storage array with four controller nodes and two PDUs per node, how many redundant circuits should be used at a MINIMUM?

For fundamental power redundancy, a minimum of two independent power circuits (or feeds) is required. This setup allows the entire storage array to continue operating if one power circuit fails, as all redundant components would be connected across these two independent circuits.

While there are multiple PDUs involved, the question asks for the minimum number of redundant *circuits*, and two circuits are sufficient for basic redundancy.

Eight circuits would provide a very high level of granularity for power distribution but is far beyond the minimum required for basic redundancy.

Sixteen circuits would be excessive and unnecessarily complex for the stated requirement of a minimum redundant power supply.