Hello,
Not sure what DWWD could mean, does that mean they can change , if so your 
zoning config needs to be redone each time and you would get I|O errors, 
not sure why would any one want WWN change in the San? This is different 
then serial number masking as it's done on ADIC etc, allowing you to swap 
out faulty hardware not impacting your zoning and jbconfig. ( I have 
noticed need to reload the drivers atleast in Windows environment with 
firmware updates etc).
Can you explain the situation a little better ?

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