For the NetApp FAS systems, a logical unit (LU) is a subdirectory in an internal file system.
LUs that are exported by the NetApp FAS system report identification descriptors in the vital product data (VPD). Thesystem uses the LUN-associated binary type-3 IEEE Registered Extended descriptor to identify the LU. For a NetApp LUN that is mapped to the system, set the LUN Protocol Type to Linux.
The NetApp FAS system does not use LU groups so that all LUs are independent. The LU access model is active-active. Each LU has a preferred filer, but can be accessed from either filer. The preferred filer contains the preferred access ports for the LU. The system detects and uses this preference.
The NetApp FAS reports a different worldwide port name (WWPN) for each port and a single worldwide node name (WWNN).