Thursday, November 20, 2014

Difference between WWN, WWPN and WWNN

Have you ever wondered about the differences between WWPN, WWN and WWNN ?
Well, I had to dig google. so, here is what I found to explain the difference in a way I could understand.

WWN:
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.

WWPN:
World Wide Port NameWWPN, or WWpN, is a World Wide Name assigned to a port in a Fibre Channel fabric. Used on storage area networks, it performs a function equivalent to the MAC address in Ethernet protocol, as it is supposed to be a unique identifier in the network.

WWNN:
World Wide Node NameWWNN, or WWnN, is a World Wide Name assigned to a node (an endpoint, a device) in a Fibre Channel fabric. It is valid for the same WWNN to be seen on many different ports (different addresses) on the network, identifying the ports as multiple network interfaces of a single network node.


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  • Difference between WWN, WWPN and WWNN Have you ever wondered about the differences between WWPN, WWN and WWNN ? Well, I had to dig google. so, here is what I found to explain the difference in a way I could understand. WWN: A World Wide Name (WWN)… Read More

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