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    Re: iSCSI: 2.2.6. Naming & mapping



    julian_satran@il.ibm.com wrote:
    
    > Not again (what is the sign for frustration?)... I mean not before the next
    > version.
    >
    > Julo
    >
    > Raghavendra Rao <Jp.Raghavendra@EBay.Sun.COM> on 14/09/2000 21:04:02
    >
    > Please respond to Raghavendra Rao <Jp.Raghavendra@EBay.Sun.COM>
    >
    > To:   Julian Satran/Haifa/IBM@IBMIL
    > cc:
    > Subject:  iSCSI: 2.2.6. Naming & mapping
    >
    > I feel that a LUN should be very much part of the Naming scheme
    > that has been proposed in the draft, regardless of the level of
    > enforcement of the scheme by implementors. LUNs are very much
    > part of SCSI addressing, and where LUN doesn't exist, zero is
    > assumed.
    >
    > Without a LUN identifier, Naming section doesn't look complete.
    >
    > Do you have insights why it is omitted ? Is this by design or overlook ?
    >
    > Thanks.
    > -JP
    
    About the topic of naming a LU, what seems to be  a benefit for me, is to
    adopt the same requirement as fibre channel: each LU MUST provide a
    unique identifier (from the Device Identification Page).
    From what i read it seems that it is not a big deal to add this page in a LU.
    However, this unique identifier is not needed for iSCSI protocol to work.
    It doesn't interact with the protocol.
    
    But from an administration point of view, to configure a server using storage
    through iSCSI, the existence of this unique identifier helps a lot.
    It allows the configuration product to know/check  if various LUNs correspond
    to the same LU, it could help to manage  the  LU migration (the LUN is changed
    
    inside a target for the same LU).
    It simplifies the configuration software by avoiding it to fake a unique LU
    identifier.
    It will help in having a configuration tool for iSCSI that can be closer to
    the one
    used with FC.
    
    Is somebody knowing if it is planned to incorporate this Device Identification
    Page
    in the iSCSI LU? Will it be mandatory? Which format (identifier type) will be
    used?
    FC  uses the type 3 (FC_PH Name_Identifier).
    
    Regards,
    
    Pierre
    
    
    
    


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Last updated: Tue Sep 04 01:07:17 2001
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