Transports can operate in either Legacy Mode or Virtual Port Mode.
When using Virtual Port mode, Virtual Ports change IO ports from a physical to a virtualized representation. This eliminates the need for primary and reserve ports. All ports are primary and can read and write IO. If a port fails, another port within the Fault Domain takes over for the failed port.
For best performance, Dell strongly recommends using Virtual Port Mode, unless you are connecting to specific hardware or software that does not support it. If you do not choose Virtual Port mode now, there could be a service interruption if you convert later.
When using Legacy mode, primary and reserved ports sets are defined where read and write IO is performed only on primary ports. When using Legacy Mode on dual-controller system and a controller fails, the primary ports from the failed controller are moved to the reserved ports on the remaining controller.
Select the operational mode to be configured for each transport, and then select Continue.
Select Skip Port Initialization if you do not wish to proceed with initialization of ports at this time.
The system ports must be configured before volumes can be mapped to servers. If you skip port initialization, the ports must be configured later.