HP Fibre Channel Mass Storage Adapters Support Guide FibrChanl-02 (fclp) Driver HP-UX 11i v2 and 11i v3

Public Loop devices have an Arbitrated Loop Physical Address (AL_PA). The AL_PA usually appears
in the least significant byte of the device's N_Port ID. Direct Fabric Attach devices do not have an
AL_PA and the least significant byte of their N_Port ID is usually 0. This is dependent on the switch
implementation. Not all switches adhere to this scheme.
Some switches enable devices in Private Loop mode to connect to a fabric. These switches typically
translate the Private Loop device as either a Public Loop or Direct Fabric Attach device to the rest
of the fabric. These switches also typically translate the rest of the fabric as Private Loop devices
to the Private Loop device.
12 Fibre Channel Adapter Installation