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    Re: iSCSI Naming and Discovery Requirements Document



    
    Ralph,
    
    IMHO, there is as yet some confusion with respect to the interpretation of
    SAM's "service delivery port" for iSCSI.  For example, is a service
    delivery port just a NIC (and so is addressed by MAC), or is it an
    ipaddress:TCPport (that might get resolved to any one of a number of NICs)
    or can a service delivery port span multiple ipaddress:TCPport connections
    (so that it is defined as the coalescing of all the socket connections in a
    single session)?
    
    As you are aware, the answer has implications with respect to reservations
    and the like, so this needs to be answered carefully.
    
    My "sense of the group" is that the third option captures what is desired
    for reservations.  Namely, the iSCSI session is presented to the SCSI layer
    as defining the I_T nexus.  This means (I think) that the service delivery
    port is neither the physical NIC nor the logical ipaddress:TCPport but more
    precisely the "endpoint" of a session.
    
    I could be wrong both on the implications of session in this context and in
    my "sense of the group", but I throw this out for discussion and
    clarification.
    
    Jim Hafner
    
    
    Ralph Weber <ralphoweber@compuserve.com>@ece.cmu.edu on 11-27-2000 07:32:40
    AM
    
    Please respond to ENDL_TX@computer.org
    
    Sent by:  owner-ips@ece.cmu.edu
    
    
    To:   ips@ece.cmu.edu
    cc:
    Subject:  Re: iSCSI Naming and Discovery Requirements Document
    
    
    
    In "3. Naming and Discovery Requirements" list entry 2) contains
    the following sentence:
    
    "The iSCSI service delivery port address is made up of IP address
    and  port number."
    
    Later, in or after list entry 6) the following appears:
    
    "The initiator can access the target using the following:
     i) IP name or IP address
            +
     ii) TCP port number
            +
     iii) [Target WWUI  or (Target WWUI and path)]"
    
    Is the "port number" described in list entry 2) the same as the
    "TCP port number" described in list entry 6)?
    
    If they are the same, I suggest that list entry 2) needs to be
    clarified because I read it to indicate that multiple hardware
    ports might be used to access a single IP address.
    
    Thanks.
    
    Ralph...
    
    
    
    
    
    
    
    


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