RE: iSCSI: LUN in Data-out and NOP PDU's

["Eddy Quicksall" <Eddy_Quicksall@ivivity.com>]

1) Can someone please give an example of how the LUN would be used in
a NOP PDU.
2) If the NOP-In is used as a ping, the TTT is set to a valid value
and the LUN must be set to a correct value when the TTT is valid. But,
if the ping comes from the target (not an LU), then what should the
LUN contain?

Eddy

-----Original Message-----
From: Sanjay Goyal [mailto:sanjay_goyal@ivivity.com]
Sent: Friday, December 28, 2001 1:38 PM
To: Eddy Quicksall
Subject: FW: iSCSI: LUN in Data-out and NOP PDU's


-----Original Message-----
From: Julian Satran [mailto:Julian_Satran@il.ibm.com]
Sent: Friday, December 28, 2001 11:17 AM
To: Sanjay Goyal
Subject: RE: iSCSI: LUN in Data-out and NOP PDU's



Sanjay,

I am not sure I understand you question.
The NOPs follow the pattern of all other target to initiator PDUs that
expect a follow-up action (like R2T) when they do.
For this they use TTT+LUN.

If they are originated or not at the LU or a front-end device is an
"implementation detail".

Julo




                    Sanjay Goyal

                    <sanjay_goyal@iv       To:     Julian
Satran/Haifa/IBM@IBMIL, Eddy Quicksall
                    ivity.com>
<Eddy_Quicksall@ivivity.com>

                                           cc:     "'ips@ece.cmu.edu'"
<ips@ece.cmu.edu>
                    27-12-01 18:09         Subject:     RE: iSCSI: LUN
in Data-out and NOP PDU's









Hi
to be very specific on the question,
 Nop-out and Nop-in PDUs are used by Initiators and Targets also to
ping
each other. If a target is trying to ping the Initiator, why does it
need
to use a particular combination of TTT and LUN i.e. the "virtual
target".
Should we really use TTT and LUN pair for a function which is for
target
and not for "virtual target"  OR am i missing something.

Regards
Sanjay Goyal
     -----Original Message-----
     From: Julian Satran [mailto:Julian_Satran@il.ibm.com]
     Sent: Saturday, December 22, 2001 3:37 AM
     To: Eddy Quicksall
     Cc: ips@ece. cmu. edu (E-mail); owner-ips@ece.cmu.edu
     Subject: Re: iSCSI: LUN in Data-out and NOP PDU's


     Eddy,

     It was felt that TTT management could be kept local to the LU or
group
     of LUs (no requirement to be unique on target).
     The combination LU and TTT is used instead. That enables groups
of
     entities to form a "virtual target".

     Julo



   "Eddy Quicksall"

   <Eddy_Quicksall@ivivity.com>            To:        "ips@ece. cmu.

   Sent by: owner-ips@ece.cmu.edu  edu \(E-mail\)" <ips@ece.cmu.edu>

                                           cc:

                                           Subject:        iSCSI: LUN

   21-12-01 22:38                  in Data-out and NOP PDU's








     What is the LUN for in Data-out and NOP-out PDU's?


     I assume the LUN in Data-out could be used for steering but I
don't
     know what the LUN in NOP-out PDU's is for.


     Eddy