Storage adapters provide connectivity for your ESXi host to a specific storage unit or network.
ESXi supports different classes of adapters, including SCSI, iSCSI, RAID, Fibre Channel, Fibre Channel over Ethernet (FCoE), and Ethernet. ESXi accesses the adapters directly through device drivers in the VMkernel.
Depending on the type of storage you use, you might need to enable and configure a storage adapter on your host.
For information on setting up software FCoE adapters, see Configuring Fibre Channel over Ethernet.
For information on configuring different types of iSCSI adapters, see Configuring iSCSI and iSER Adapters and Storage.