Changing VTAM with VARY commands

One way you can change VTAM® is by using a VARY command. The VARY commands affect the status of each physical resource and session. They enable you to activate and deactivate individual resources or sessions. Using VARY commands, you can change the status of all resources, and you can change VTAM internal operations, such as path definitions.

In an earlier scenario, the inactive logical unit L3A3278B was shown as being downstream from NCP3AA1. To review the status of this LU, the operator enters:

d net,id=L3A3278B,scope=all

The display shows that the logical unit is still inactive.

d net,id=L3A3278B,scope=all  
IST097I DISPLAY ACCEPTED  
IST075I NAME = NETA.L3A3278B, TYPE = LOGICAL UNIT  
IST486I STATUS= NEVAC, DESIRED STATE= INACT  
IST977I MDLTAB=***NA*** ASLTAB=***NA***  
IST861I MODETAB=MODETAB2 USSTAB=***NA*** LOGTAB=***NA***  
IST934I DLOGMOD=***NA*** USS LANGTAB=***NA***  
IST597I CAPABILITY-PLU INHIBITED,SLU INHIBITED,SESSION LIMIT 00000001  
IST081I LINE NAME = LN3A1, LINE GROUP = GRP3A1, MAJNOD = NCP3AA1  
IST135I PHYSICAL UNIT = P3A3274A  
IST082I DEVTYPE = LU  
IST654I I/O TRACE = OFF, BUFFER TRACE = OFF  
IST228I ENCRYPTION = NONE, TYPE = DES  
IST171I ACTIVE SESSIONS = 0000000000, SESSION REQUESTS = 0000000000  
IST172I NO SESSIONS EXIST  
IST314I END

To activate the previously inactive logical unit, the operator enters:

v net,act,id=L3A3278B

The display shows:

v net,act,id=L3A3278B  
IST097I VARY ACCEPTED  
IST093I L3A3278B ACTIVE

If the operator reissues the DISPLAY command, the display changes as shown:

d net,id=L3A3278B,scope=all  
IST097I DISPLAY ACCEPTED  
IST075I NAME = NETA.L3A3278B, TYPE = LOGICAL UNIT  
IST486I STATUS= ACTIV, DESIRED STATE= ACTIV  
IST977I MDLTAB=***NA*** ASLTAB=***NA***  
IST861I MODETAB=MODETAB2 USSTAB=***NA*** LOGTAB=***NA***  
IST934I DLOGMOD=***NA*** USS LANGTAB=***NA***  
IST597I CAPABILITY-PLU INHIBITED,SLU ENABLED  ,SESSION LIMIT 00000001  
IST081I LINE NAME = LN3A1, LINE GROUP = GRP3A1, MAJNOD = NCP3AA1  
IST135I PHYSICAL UNIT = P3A3274A  
IST082I DEVTYPE = LU  
IST654I I/O TRACE = OFF, BUFFER TRACE = OFF  
IST228I ENCRYPTION = NONE, TYPE = DES  
IST171I ACTIVE SESSIONS = 0000000000, SESSION REQUESTS = 0000000000  
IST172I NO SESSIONS EXIST  
IST314I END

In this display, IST486I indicates that the desired and current states are now active.