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    iSCSI: Task Management



    
    I dont know whether this has been raised before.
    
    With reference to the Task Management section of the document, it is my
    opinion
    that the target reset function from an initiator should be limited to the
    LUNS
    exposed to that initiator, and the connections to only that initiator be
    closed.
    The motivation is that an initiator with access to a single LUN should not
    be
    able to bring down an entire target device with 1000s of LUs. From my
    experience,
    there are enough buggy initiators which can generate target resets at the
    first chance.
    
    Implementors may control Target Reset behavior with Jim Hafner's access
    control
    stuff in T10.
    
    Sincerely,
    Prasenjit
    
    
    -----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
    
    <!--StartFragment-->3.7.1.  Function
    
         The Task Management functions provide an initiator with a way to
         explicitly control the execution of one or more Tasks. The Task
         Management functions are summarized as follows (for a more detailed
         description see the [SAM2] document):
              1    Abort Task---aborts the task identified by the Referenced
                   Task Tag field.
              2    Abort Task Set---aborts all Tasks issued by this initia-
                   tor on the Logical Unit.
              3    Clear ACA---clears the Auto Contingent Allegiance condi-
                   tion.
              4    Clear Task Set---Aborts all Tasks (from all initiators)
                   for the Logical Unit.
              5    Logical Unit Reset.
              6    Target Reset.
         For the functions above except <Target Reset>, a SCSI Task Manage-
         ment Response is returned, using the Initiator Task Tag to identify
         the operation for which it is responding.  For the <Target Reset>
    
    
    
    Satran, Smith, Sapuntzakis, Meth                               [Page 23]
    
    iSCSI                         June 2000
    
    
         function, the target cancels all pending operations. The target may
         send an Asynchronous Event to all attached initiators notifying
         them that the target is being reset.  The target then closes all of
         its TCP connections to all initiators (all sessions are ter-
         minated).
    
    
    <!--EndFragment-->
    
    
    
    
    
       Prasenjit Sarkar
       Research Staff Member
       IBM Almaden Research
       San Jose
    
    


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Last updated: Tue Sep 04 01:06:41 2001
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