On Jan 16, 6:06pm, Martin Peschke wrote:
> > >
> > > to find alternate paths by means of WWN? Yes.
> >
> > There will have to be distinction between the node name and the
> > port name (from what I can see, WWN can refer to either, though
> > maybe a more precise definition has been made).
>
> 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.
I agree.
> > 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?
Generally, it involves doing a mode sense to a vendor unique mode page
and getting the "signature" for the lun. In some cases, the signature
is part of the Inquiry data.
jeremy
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