On Tue, 16 Jan 2001, Prasenjit Sarkar wrote:
>
>
>
> 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?
>
> -----------------------------------------------------------------------------
>
> 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).
I am aware of these drafts or standards. But I can't find VPID.
I know VPD (Vital Product Data).
Regards
Martin Peschke
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