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    Re: iSCSI: naming/LUN views



    
    Pierre,
    
    In my view, one should get the same LU view in your situation because there
    is effectively no other information by which the target might present a
    different view.  Namely, the target (that creates/enforces the view) is the
    entity scoped by the TargetWWUI.  It uses the Initiator WWUI to construct
    that LU view.  That might be constructed by rules established via SCSI
    access controls (and yes, the InitiatorWWUI is the right mapping to
    TransportID though that has not been formalized anywhere yet).
    
    This has some interesting implications.  Within the context of a single
    SESSION established through multiple connections, there is only the one I_T
    nexus.  But we can also establish multiple sessions between the same
    InitiatorWWUI and TargetWWUI.  As far as access controls are concerned, the
    views should be identical.  As for other properties of I_T nexus', e.g.,
    reservations, the jury is still out.
    
    Jim Hafner
    
    
    Pierre Labat <pierre_labat@hp.com>@ece.cmu.edu on 02-27-2001 10:38:26 AM
    
    Sent by:  owner-ips@ece.cmu.edu
    
    
    To:   ips@ece.cmu.edu
    cc:
    Subject:  iSCSI: naming/LUN views
    
    
    
    Mark (Bakke),
    
    
    After going through the naming/discovery drafts,
    a question came to my mind:
    
    Does several connections flowing through
    several portals but using  the same initiator WWUI
    and target WWUI will see the same thing on the target?
    I mean by same thing: same LUs associated to the same LUNs.
    
    I guess that the initiator WWUI acts as an transportID (SCSI access
    control)
    and gives the same LUs view independently of the portal used.
    Is it the case?
    
    
    If it is not the case, the entity that creates multiconnections
    sessions
    will need out of band information to know if the  2 portals can be used
    for a same session or will have to do the  painfull job to compare the
    LU views
    from the two portals with no guarantee that the views could not change
    in the future.
    
    Regards,
    
    Pierre
    
    
    
    
    
    


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Last updated: Tue Sep 04 01:05:30 2001
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