Storage adapters provide connectivity for your ESX host to a specific storage unit or network.

Depending on the type of storage you use, you might need to install or enable a storage adapter on your host. ESX supports different classes of adapters, including SCSI, iSCSI, RAID, Fibre Channel, Fibre Channel over Ethernet (FCoE), and Ethernet. ESX accesses the adapters directly through device drivers in the VMkernel.