A World Wide Name (WWN) or World Wide Identifier (WWID) is a unique identifier used in storage technologies including Fibre Channel, Advanced Technology Attachment (ATA) or Serial Attached SCSI (SAS). A WWN may be employed in a variety of roles, such as a serial number or for addressability; for example, in Fibre Channel networks, a WWN may be used as a WWNN (World Wide Node Name) to identify a switch, or a WWPN (World Wide Port Name) to identify an individual port on a switch. Two WWNs which do not refer to the same thing should always be different even if the two are used in different roles, i.e. a role such as WWPN or WWNN does not define a separate WWN space. The use of burned-in addresses and specification compliance by vendors is relied upon to enforce uniqueness.
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Famous quotes containing the words world and/or wide:
“It is of the nobility of man’s soul that he is insatiable: for he hath a benefactor so prone to give, that he delighteth in us for asking. Do not your inclinations tell you that the WORLD is yours?”
—Thomas Traherne (1636–1674)
““... Farewell then,
Until, under a better sky
We may meet expended, for just doing it
Is only an excuse. We need the tether
Of entering each other’s lives, eyes wide apart, crying.””
—John Ashbery (b. 1927)