Well, WWN may be either WWPN (port name) or WWNN (node name).
According to the mapping of targetID and D_ID, WWPN seems to be the right
choice.
> Of course, some devices allow access to a given storage through
> different nodes as well as different ports. There are a vendor
an example:
http://www.storage.ibm.com/hardsoft/products/ess/support/essfcwp.pdf
> unique methods of determining when that is the case, unfortunately.
> I presume such devices are beyond the scope of this proposal.
Do you know more about such methods?
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Actually, the SCSI INQUIRY command with EVPD bit on and page code 83 should
return the VPID of every LU -- this command is used by some SCSI initiators
and most multipathing drivers to determine whether the same LU has been
accessed through different paths.
You can find more details in SPC-2 (or SPC-3).
prasenjit
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