Displaying the status of an LU

To display the status of an LU definition, use the following command:

DISPLAY NET,ID=node_name,E

In this example, node_name is the major or minor node name for which you want to display the status.

Displaying the status of a major node lists all of the minor nodes defined to the major node and their STATUS field. For complete information about status of a minor node, specify the actual minor node name in the command.

The STATUS field for a successfully activated LU definition is set to “CONCT,” which means connectable. An LU in this state is waiting for the SNALINK LU6.2 address space to be started. An LU in the CONCT state cannot establish an LU type 6.2 conversation.

Figure 1 shows a sample of the output from an LU in connectable state.

Figure 1. DISPLAY subcommand output example for connectable LU

D NET,ID=SNAL621A,E                                                
IST097I DISPLAY ACCEPTED                                           
IST075I NAME = NETA.SNAL621A, TYPE = APPL 573                      
IST486I STATUS= CONCT, DESIRED STATE= CONCT                        
IST1447I REGISTRATION TYPE = CDSERVR                               
IST977I MDLTAB=***NA*** ASLTAB=***NA***                            
IST861I MODETAB=***NA*** USSTAB=***NA*** LOGTAB=***NA***           
IST934I DLOGMOD=LU62MODE USS LANGTAB=***NA***                      
IST1632I VPACING =  0                                              
IST597I CAPABILITY-PLU INHIBITED,SLU INHIBITED,SESSION LIMIT NONE  
IST231I APPL MAJOR NODE = SNALNK1A                                 
IST654I I/O TRACE = OFF, BUFFER TRACE = OFF                        
IST1500I STATE TRACE = OFF                                         
IST271I JOBNAME = ***NA***, STEPNAME = ***NA***, DSPNAME = ***NA***
IST228I ENCRYPTION = OPTIONAL , TYPE = DES                         
IST1563I CKEYNAME = SNAL621A CKEY = PRIMARY CERTIFY = NO           
IST1552I MAC = NONE MACTYPE = NONE                                 
IST1050I MAXIMUM COMPRESSION LEVEL - INPUT = 0, OUTPUT = 0         
IST1633I ASRCVLM = 1000000                                         
IST1634I DATA SPACE USAGE: CURRENT = ***NA*** MAXIMUM = ***NA***   
IST171I ACTIVE SESSIONS = 0000000000, SESSION REQUESTS = 0000000000
IST172I NO SESSIONS EXIST                                          
IST314I END

After the SNALINK LU6.2 address space has successfully started, the STATUS field is set to ACTIV, which means in use by an address space.

Figure 2 shows a sample of the output from a DISPLAY command for an LU in active state.

Figure 2. DISPLAY subcommand output example for active LU

D NET,ID=SNAL621A,E                                                
IST097I DISPLAY ACCEPTED                                           
IST075I NAME = NETA.SNAL621A, TYPE = APPL 545                      
IST486I STATUS= ACT/S, DESIRED STATE= ACTIV                        
IST1447I REGISTRATION TYPE = CDSERVR                               
IST977I MDLTAB=***NA*** ASLTAB=***NA***                            
IST861I MODETAB=***NA*** USSTAB=***NA*** LOGTAB=***NA***           
IST934I DLOGMOD=LU62MODE USS LANGTAB=***NA***                      
IST1632I VPACING =  0                                              
IST597I CAPABILITY-PLU ENABLED  ,SLU ENABLED  ,SESSION LIMIT NONE  
IST231I APPL MAJOR NODE = SNALNK1A                                 
IST654I I/O TRACE = OFF, BUFFER TRACE = OFF                        
IST1500I STATE TRACE = OFF                                         
IST271I JOBNAME = SNAL621A, STEPNAME = SNAL621A, DSPNAME = IST84E76
IST228I ENCRYPTION = OPTIONAL , TYPE = DES                         
IST1563I CKEYNAME = SNAL621A CKEY = PRIMARY CERTIFY = NO           
IST1552I MAC = NONE MACTYPE = NONE                                 
IST1050I MAXIMUM COMPRESSION LEVEL - INPUT = 0, OUTPUT = 0         
IST1633I ASRCVLM = 1000000                                         
IST1634I DATA SPACE USAGE: CURRENT = 0 MAXIMUM = 136               
IST171I ACTIVE SESSIONS = 0000000003, SESSION REQUESTS = 0000000000
IST206I SESSIONS:                                                  
IST634I NAME     STATUS         SID          SEND RECV VR TP NETID 
IST635I SNAL622A ACTIV-S    EAABEEC3D9B90C37 0002 0000  0  0 NETA  
IST635I SNAL622A ACTIV/SV-S EAABEEC3D9B90C35 0002 0002  0  0 NETA  
IST635I SNAL622A ACTIV-P    F6ABEEC3DCB90B7D 0000 0002  0  0 NETA  
IST314I END

This example shows that the SNALINK LU6.2 address space (SNAL621A) has been started successfully and has its local LU (SNAL621A) in use with three sessions active to a remote LU (SNAL622A).

For each SNALINK LU6.2 connection, VTAM® establishes three sessions between the application LUs. The first is the control session, which is the middle session in the example. The other two sessions are established for the LU type 6.2 conversations allocated for the connection, one for sending data and one for receiving data.

See z/OS Communications Server: SNA Operation for more information about the DISPLAY command.