This read-create object holds the administrator-configurable World Wide Name assigned to a specific VSAN, and per the desc, creating a new row in this table requires setting a valid WWN value at creation time. It lets an admin explicitly assign a chosen WWN identity to a VSAN rather than relying purely on auto-generated values. For example, an admin migrating a VSAN configuration between switches while preserving its identity would explicitly set wwnmVsanWwn to match the original VSAN's known WWN.