On Pure Storage FlashArray//X R2 and R3 models, the port naming convention is sequential and determined by the slot number where the I/O card is installed. The numbering for ports on add-in cards begins after any built-in ports. For a 4-port Fibre Channel (FC) card, the system allocates a block of four port numbers. Slot 0 is assigned ports 0-3, Slot 1 is assigned ports 4-7, and Slot 2 is assigned ports 8-11. Therefore, a 4-port FC card installed in slot 1 will have the interface names FC4, FC5, FC6, and FC7.

A. FC0, FC1, FC2, and FC3: These interface names correspond to a 4-port FC card installed in slot 0, not slot 1.

C. FC5, FC6, FC7, and FC8: This is an incorrect numbering sequence. Port numbering is allocated in contiguous blocks of four, starting from a multiple of four (e.g., 0, 4, 8).

1. Pure Storage, "FlashArray//X Hardware Guide": In the section "I/O Module and Port Numbering," the guide provides a table that explicitly maps slot numbers to port numbers. It shows that for a 4-port module, Slot 1 corresponds to ports 4, 5, 6, and 7. (Note: Specific document version may vary, but this information is consistent across //X R2/R3 documentation).

2. Pure Storage, "FlashArray Best Practices": The networking best practices section often includes diagrams of controller backplanes which visually confirm the port numbering scheme. The diagrams for //XR2 and //XR3 models illustrate that the first I/O slot (Slot 1) after the base module (Slot 0) uses the port range 4-7 for 4-port cards.