I'm sorry its VPD (it was a typo) data - anyways it is not universally
implemented
(though it should be).
Prasenjit Sarkar
Research Staff Member
IBM Almaden Research
San Jose
Martin Peschke <[EMAIL PROTECTED]>@vger.kernel.org on 01/18/2001
09:05:00 AM
Sent by: [EMAIL PROTECTED]
To: Prasenjit Sarkar/Almaden/IBM@IBMUS
cc: Jeremy Higdon <[EMAIL PROTECTED]>,
[EMAIL PROTECTED]
Subject: Re: [PATCH, RFC] SCSI cleanups for 2.5
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
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to [EMAIL PROTECTED]
-
To unsubscribe from this list: send the line "unsubscribe linux-scsi" in
the body of a message to [EMAIL PROTECTED]
