Chapter 5. Host configuration 229
When NPIV is enabled on IBM Spectrum Virtualize system nodes, each physical WWPN
reports up to three virtual WWPNs, as shown in Table 5-1.
Table 5-1 Spectrum Virtualize NPIV Ports’s
Figure 5-36 depicts the three WWPNs associated with an SVC port when NPIV is enabled.
Figure 5-36 Allocation of NPIV virtual WWPN ports per physical port
The failover host attach port (in pink) is not active at this time. Figure 5-37 on page 230 shows
what happens when the second node fails. Subsequent to the node failure, the failover host
attach ports on the remaining node are active and have taken on the WWPN of the failed
node’s primary host attach port.
NPIV port Port description
Primary NPIV Port This is the WWPN that communicates with backend storage, and
might be used for node to node traffic. (Local or remote.)
Primary Host Attach Port This is the WWPN that communicates with hosts. It is a target port
only, and this is the primary port, so it represents this local node’s
WWNN.
Failover Host Attach Port This is a standby WWPN that communicates with hosts and is only
brought online on this node if the partner node in this I/O Group goes
offline. This is the same as the Primary Host Attach WWPN on the
partner node.
Note: Figure 5-37 on page 230 shows only two ports per node in detail, but the same
applies for all physical ports.
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