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    RE: iscsi : target port definition



    They way I see it is the Target Portal Group is a way for target
    administrators to logically group things so the initiator knows which
    addresses:ports to use when establishing a nexus.
    
    Isn't that the main purpose?
    
    Eddy
    
    -----Original Message-----
    From: Santosh Rao [mailto:santoshr@cup.hp.com]
    Sent: Thursday, September 13, 2001 8:38 PM
    To: IPS Reflector
    Subject: iscsi : target port definition
    
    
    Hello,
    
    I have a question on the interpretation of the iscsi target port
    definition. The iscsi rev 08 defines the iscsi target port to map to an
    iscsi target portal group.
    
    Thus, any iscsi target that wishes to allow multiple SCSI paths to be
    established to the target node MUST provide at least 2 iscsi target
    portal groups.
    
    The above definition of an iscsi target port somewhat alters the
    semantics of a target portal group. A target portal group, by
    definition, is a collection of a set of network portals within the
    target across which a session can be spanned.
    
    Thus, if a target supports a multi-connection session spanning across
    all its network portals, such a target would use a single target portal
    group to indicate that 1 big fat session pipe could be established to
    all its network portals. This, in turn, would have the side effect of
    only providing 1 scsi path to the upper layer wedge drivers, if the
    iscsi initiators establish a session per target portal group. [which is
    the target port].
    
    From an initiator's perspective, what should be the target side
    end-point of an initiator's sessions when it may need to support upper
    layer wedge drivers ? Should the initiator establish a session per
    target
    portal group [, in which case the above issue exists] ? Or, should it
    establish a session per TargetAddress ??
    
    Regards,
    Santosh
    
    
    


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Last updated: Fri Sep 14 14:17:10 2001
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