In what way do file engine nodes directly connect to controller enclosures?

When directly connecting file engine nodes to controller enclosures, you are advised to use a high-redundancy connection method to achieve optimal availability.
? Redundant ports (high redundancy)
Each file engine node uses two optical fibers to connect to each controller (that is, connect to two Fibre Channel ports of the controller).
? Redundant controllers (medium redundancy)
Each file engine node uses one optical fiber to connect to each controller (that is, connect to one Fibre Channel port of the controller).
? Redundant controller enclosures (low redundancy)
Each clustered NAS node uses one optical fiber to connect to one controller (that is, connect to any Fibre Channel port of the controller).

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