Which of the following offers the highest level of redundancy in the design of a storage system?

The option that offers the highest level of redundancy in the design of a storage system is two Dual Port HBAs connected to a pair of fiber switches.

This configuration provides several layers of redundancy. First, having two Dual Port HBAs means that there are multiple paths for data to travel to the storage area network (SAN). Each HBA can communicate through its two ports, allowing for increased bandwidth and failover capabilities if one port or HBA fails.

Additionally, connecting these HBAs to a pair of fiber switches further enhances redundancy. If one fiber switch fails, the remaining switch can maintain connectivity, ensuring that the system remains operational. This design not only improves fault tolerance but also allows for load balancing across multiple paths, which can enhance performance.

In summary, the combination of dual-port HBAs and multiple switches creates a robust infrastructure that minimizes points of failure, allowing for continual access to storage resources even in the event of hardware malfunctions. This is why this configuration is recognized as providing the highest level of redundancy among the options presented.