From How NPIV-Based LUN Access Works
[http://pubs.vmware.com/vi35/wwhelp/wwhimpl/common/html/wwhelp.htm?context=fibre_san_config&file=esx_san_cfg_manage.8.17.html]
:
> SAN objects, such as switches, HBAs, storage devices, or virtual machines can be
assigned World Wide Name (WWN) identifiers. WWNs uniquely