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A World Wide Name (WWN) or World Wide Identifier (WWID) is a unique identifier used in storage technologies including Fibre Channel, Parallel ATA, Serial ATA, NVM Express, SCSI and Serial Attached SCSI (SAS).
A WWN that is allocated to a node is called a World Wide Node Name (WWNN).
A WWN that is allocated to a port or other SAN service is referred to as a World Wide Port Name (WWPN).
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