RE: iSCSI: DLB's [T.6] 2.3 iSCSI Session Types

["Julian Satran" <Julian_Satran@il.ibm.com>]

This was subject to a long debate relate to SendTargets.
The issue was that SendTargets was (with resistance) accepted as a
"lightweight" discovery.
We did not want in any way to encourage long-lived discovery sessions as
there are other and better mechanisms
to do so (SLP, iSNS) and iSCSI should not have a completely embedded
discovery (going to IP storage
should enable you to leverage other protocols for management).
I will strongly oppose anything that encourages long lived discovery and I
think that using the last call to reopen
without any new argument an old and closed issue is an abuse of the
process.

Julo


                                                                                                                                            
                      "Ayman Ghanem"                                                                                                        
                      <aghanem@cisco.co        To:       <Black_David@emc.com>, <ips@ece.cmu.edu>                                           
                      m>                       cc:                                                                                          
                      Sent by:                 Subject:  RE: iSCSI: DLB's [T.6] 2.3  iSCSI Session Types                                    
                      owner-ips@ece.cmu                                                                                                     
                      .edu                                                                                                                  
                                                                                                                                            
                                                                                                                                            
                      07/08/2002 06:53                                                                                                      
                      PM                                                                                                                    
                      Please respond to                                                                                                     
                      "Ayman Ghanem"                                                                                                        
                                                                                                                                            
                                                                                                                                            



David,

The issue that came up before was if a discovery session could be kept
open,
why not allow the initiator and target to send NOPs, and allow the target
to
send Async messages when new targets become available?

I don't mean to bring up this issue again at this stage, but using "MAY"
leaves room for implementations that want to support this. If we allow NOP
and Async PDUs on a discovery session, then changing "MAY" to "MUST" will
be
fine.

-Ayman


> -----Original Message-----
> From: Black_David@emc.com [mailto:Black_David@emc.com]
> Sent: Monday, July 08, 2002 9:19 AM
> To: aghanem@cisco.com; ips@ece.cmu.edu
> Subject: RE: iSCSI: DLB's [T.6] 2.3 iSCSI Session Types
>
>
> Ayman,
>
> Something needs to be cleaned up here, as the current text appears
> to allow all types of iSCSI PDUs on a discovery session.  I didn't
> intend to restrict a discovery session to one Send Targets followed
> by a logout (i.e., it could be kept open with the initiator periodically
> sending a new Send Targets to see if anything has changed), but I
> did intend to forbid SCSI commands, task management, etc. on Discovery
> sessions.  Is that reasonable, or are there additional types of iSCSI
> PDUs that you want to see allowed for new device notifications?
>
> Thanks,
> --David
>
> > -----Original Message-----
> > From: Ayman Ghanem [mailto:aghanem@cisco.com]
> > Sent: Sunday, July 07, 2002 12:41 PM
> > To: ips@ece.cmu.edu
> > Subject: RE: iSCSI: DLB's [T.6] 2.3 iSCSI Session Types
> >
> >
> > I prefer leaving this as "MAY" for implementations that want
> > to support new
> > device notifications. There was a discussion on whether
> > discovery sessions
> > should be long-lived or not. Using MAY allows both without
> > breaking any
> > thing.
> >
> > -Ayman
> >
> > > [T.6] 2.3  iSCSI Session Types
> > >
> > >       b)  Discovery-session - a session opened only for
> > target discov-
> > >       ery; the target MAY accept only text requests with
> > the SendTar-
> > >       gets key and a logout request with reason "close the session".
> > >
> > > Change "MAY" to "MUST", and say that other requests MUST be
> > rejected.
> > >
> >
>