PortName vs NodeName

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Apr 13th, 2009
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Using Device manager I can go to the FLOGI tab for an fc port. Usually the PortName and the NodeName have the exact same wwn. But with our Unisys host HBA, the port name starts with 10:00 while NodeName starts with 50:80. What is the differnece betwee PortName and NodeName?

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inch Mon, 04/13/2009 - 14:34
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A WWPN (world wide port name) is the unique identifier for a fibre channel port where a WWN (world wide name) the unique identifier for the node itself.

A good example is a dual port HBA. There will be two WWPN's (one for each port) and only a single WWN for the card itself.

If you interested in more details I would suggest a good book on fibre channel - Cisco press have one....


rondebbs1 Mon, 04/20/2009 - 07:36
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Thanks for the good info. Any idea where I can find the book from Cisco press (url)? I was not able to locate it.

Thanks - Brad

inch Mon, 04/27/2009 - 00:20
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google: amazon cisco press james long




techcrazzy Thu, 04/23/2009 - 10:43
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pWWN and nWWN can be same if it is a single port HBA.

But in case of Dual port HBA, you will see difference. But its only the last octat would change..

If you are getting difference in the first octat, then make sure there is no virtualization application in between which can make its original pWWN...


rondebbs1 Thu, 04/23/2009 - 14:09
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It's actually the firt octet that is changing. For example the portName for my multiport Emulex card is 10000000c9592f6c. The NodeName is 2000000c9592f6c. The "1" is simply changed for "2". This is occuring for AIX Servers and Windows Servers. There is also a minor change between the portName and NodeName for my Clariion SP ports. For example portName shows 500601613021788f and NodeName for the same SP port shows 500601603021788f. The 61 changed to 60.


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