(Item 008446) Nondisruptive CP-SVR pipe deactivation: go to a different         
              DLUS                                                              
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There are currently several sense data values that the DLUS can use in a        
nondisruptive UNBIND-initiated CP-SVR pipe deactivation.  None of them          
permit the DLUR to immediately reinitiate CP-SVR pipe activation while          
requiring the DLUR to select a different DLUS for the new pipe.                 
                                                                                
A customer situation has been identified where a takeover between CMCs          
is required.  The current DLUS can deactivate the CP-SVR pipe, but the          
DLUR's reactivation logic directs it to reestablish the CP-SVR pipe with        
the same DLUS.                                                                  
                                                                                
What is needed is a new sense data value to permit the DLUR to immediately      
reinitiate CP-SVR pipe activation while requiring the DLUR to select a          
different DLUS for the new pipe.  The DLUR, upon receiving the new              
sense data, would not try to reestablish the CP-SVR pipe with the same          
DLUS, but rather with a different DLUS.                                         
                                                                                
The proposed architecture change is to define sense data X'08A0 000B' as        
                                                                                
  DLUS-DLUR Session Deactivation (Nondisruptive): DLUR should activate          
  a DLUS-DLUR session with a different DLUS if possible; otherwise,             
  it should wait for DLUS reactivation of the DLUS-DLUR session;                
  LU-LU sessions for DLUR-supported dependent LUs should not be reset.          
                                                                                
When the DLUR receives this sense data as part of a nondisruptive               
UNBIND-initiated CP-SVR pipe deactivation, the DLUR will perform the            
SSCP-PU, SSCP-LU, and LU-LU session deactivation functions already              
defined for the other nondisruptive session deactivation sense data.            
The only difference will be in pipe reactivation, i.e., the DLUR can            
immediately reinitiate CP-SVR pipe activation, but not with the same            
DLUS.                                                                           
                                                                                
If no other DLUS is defined at the DLUR, then the DLUR should perform           
the same actions as it does for sense data X'08A0 000A' when waiting for        
a DLUS to reinitiate CP-SVR pipe activation.                                    
                                                                                
DLURs and DLUSs which support UNBIND with X'08A0 000B' will set (to 1)          
a new indicator (byte 9, bit 4) in the DLUR/S Capabilities (X'51')              
control vector during CP-SVR pipe activation.