Figure 8-1 depicts the five WWPNs that are associated with a SAN Volume Controller port  when NPIV is enabled. The  failover host attach  ports are not currently active. Figure 8-2 shows what happens when  the partner node fails. After the node failure, the  failover host attach ports  on the remaining  node become active and take on the WWPN of the failed node’s  primary host attach port . Note:  Figure 8-2 shows only two ports per node in detail, but the same details apply to all  physical ports. The effect is the same for NVMe ports because they use the same NPIV  structure, but with the topology NVMe instead of regular SCSI. Chapter 8. Hosts  345 Figure 8-2 Allocation of NPIV virtual WWPN ports per physical port after a node failure Figure 8-1 Allocation of NPIV virtual WWPN ports per physical port