Administrator Guide

Physical port selection
In a system configured to use either all FC or all iSCSI ports, use the ports in the following order:
1. A0,B0
2. A2,B2
3. A1,B1
4. A3,B3
The reason for doing so is that each pair of ports (A0,A1 or A2,A3) are connected to a dedicated CNC chip. If you are not using
all four ports on a controller, it is best to use one port from each pair (A0,A2) to ensure better I/O balance on the front end.
178 Best practices