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 byte number 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. The 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: the 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] Partial List of WWN Company Identifiers

[edit] See also

[edit] External links


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