World Wide Name

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A World Wide Name (WWN) or World Wide Identifier (WWID) is a unique identifier which identifies a particular Fibre Channel, Advanced Technology Attachment (ATA) or Serial Attached SCSI (SAS) target. Each WWN is an 8 bytes derived from an IEEE OUI and vendor-supplied information.

There are two formats of WWN defined by the IEEE:

• Original format: addresses are assigned to manufacturers by the IEEE standards committee, and are built into the device at build time, similar to an Ethernet MAC address. First 2 bytes are either hex 10:00 or 2x:xx (where the x's are vendor-specified) followed by the 3-byte vendor identifier and 3 bytes for a vendor-specified serial number
• New addressing schema: first nibble is either hex 5 or 6 followed by a 3-byte vendor identifier and 36 bits for a vendor-specified serial number

[edit] List of a few WWN company identifiers

• 00:50:76 IBM
• 00:A0:98 NetApp
• 00:60:69 Brocade Communications Systems
• 00:05:1E Brocade Communications Systems, formerly owned by Rhapsody Networks
• 00:60:DF Brocade Communications Systems, formerly CNT Technologies Corporation
• 00:E0:8B QLogic HBAs, original identifier space
• 00:1B:32 QLogic HBAs. new identifier space starting to be used in 2007
• 00:C0:DD QLogic FC switches
• 00:90:66 QLogic formerly Troika Networks
• 00:11:75 QLogic formerly PathScale, Inc
• 08:00:88 Brocade Communications Systems, formerly McDATA Corporation. WWIDs begin with 1000.080
• 00:60:B0 Hewlett-Packard - Integrity and HP9000 servers. WWIDs begin with 5006.0b0
• 00:11:0A Hewlett-Packard - ProLiant servers. Formerly Compaq. WWIDs begin with 5001.10a
• 00:01:FE Hewlett-Packard - EVA disk arrays. Formerly Digital Equipment Corporation. WWIDs begin with 5000.1fe1
• 00:17:A4 Hewlett-Packard - MSL tape libraries. Formerly Global Data Services. WWIDs begin with 200x.0017.a4
• 00:60:48 EMC Corporation, for Symmetrix
• 00:60:16 EMC Corporation, for CLARiiON
• 00:10:86 ATTO Technology
• 00:23:29 DDRdrive LLC, for DDRdrive X1

[edit] See also

• Fibre Channel
• Switched fabric
• Serial Attached SCSI (SAS)
• Advanced Technology Attachment (ATA)
• World Wide Port Name (WYM)
• World Wide Node Name (WWNN)

[edit] External links

• Guidelines for Fibre Channel Use of the Organizationally Unique Identifier (OUI)
• IEEE OUI list

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