The following figure shows the recommended FC connectivity between the HBAs and the FC switches, and the connectivity between the FC switches and the Unity storage array. As shown in the figure, each port in each HBA connects to two separate FC switches, and two front-end ports from each of the Unity SPs connect to two separate FC switches, forming two FC fabrics.
Figure 3. FC fabric connectivity design
Dell EMC recommends single-initiator zoning when creating zone sets on the FC switches. For high availability, bandwidth, and load balancing, each initiator or HBA port on the ESXi host is zoned with four front-end Unity storage ports that are spread across the two storage controllers or SPs, as shown in the following logical representation of zone sets.
Figure 4. FC zoning logical representation