A previously fully redundant drive enclosure is now showing only a single path on an array. The I/O modules and enclosure connecting cables have all been replaced with known good parts. Which of the f

The enclosure controller manages the internal communication paths to the drives and presents them to the host or array. If external I/O modules and cables are functional, the controller is the most likely single point of failure causing the loss of one redundant path within the enclosure.

An enclosure address is an identifier and does not directly cause a physical path failure or redundancy loss.

A faulty drive would typically affect data access to that specific drive, not the overall path redundancy of the enclosure's connection to the array.

A power supply failure would typically result in the entire enclosure or a significant part of it losing power, not just a single path while other components remain functional.