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    CmdSN during login



    Hi
    
     Assuming Target and Initiator support multiple connections and the session
    is having multiple connections. Assuming out-of-order CmdSN is a possibility
    for this session.
    
     Connection #	1	|	2	|	3
    -------------------------------------------------------
    Login Cmd  CmdSN=0	|   CmdSN=8	|  CmdSN=9
    Txt   Cmd  CmdSN=1	|    		|   
     				|    		|   
     				|   		|   
    Login Cmd  CmdSN=7	|  CmdSN=10	|  CmdSN=11
    -------------------------------------------------------
    Data Cmd   CmdSN=12 	| CmdSN=14	| CmdSN=15
    Data Cmd   CmdSN=13	|		|
    				|		|
    
    CmdSN=7 is last of the Login sequence and it is acknowledged by the Target
    with "accept login" response.
    
    Target would receive the PDUs in this CmdSN order
     0 to 7, 8, 9, 12, 10, 11, 13, 14, 15
    
    Now as Login and Text PDUs are being processed even though you have received
    Data Cmd PDUs, you can not pass them to iSCSI layer and hence you are adding
    latency. 
    
    What I want to convey from this example is why not use CmdSN just during the
    FullFeature phase only.
    
    Regards
    Sanjay Goyal
    

    <<application/ms-tnef>>



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Last updated: Tue Sep 04 01:04:03 2001
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