Here are is a proposed change to the page on NPIV:

Before: A WWN is a 64 bit value, and should be world wide unique.

After: A WWN is a 64 bit value, and must be world wide unique.

To quote a gentleman I know speaking about WWPN duplicates and FC switches, 
"WWPN are required by spec to be unique; this is a basic expectation. The spec 
doesn't not require verification of uniqueness and therefore the results are 
indeterminate."

It should also be noted that up to 63 NPIV interfaces are allowed per physical 
HBA port. This is a limitation of this implementation and not the FC switch.
 
 
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