The operator on SYS4 begins the reactivation.

1. On SYS4, enter DISPLAY GRS. The response does not show SYS1, but does show that all other systems are QUIESCED, and that the links between the quiesced systems are ALTERNATE.
2. On SYS4, enter any one of the following:
   • VARY GRS(ALL),RESTART
   • VARY GRS(*),RESTART
   • VARY GRS(SYS4),RESTART
   On SYS4, the following message appears:

       
     ISG121I VARY REQUEST REJECTED - ENTER COMMAND ON SYSTEM SYS2
    

   • This message indicates that global resource serialization has determined that another system, SYS2 in this example, has more current resource information. The message tells the operator to enter the restart command on SYS2, which minimizes but does not entirely eliminate the data integrity exposure in reactivating a quiesced system.
3. On SYS2, enter VARY GRS(SYS2),RESTART. The following messages appear:

       
     ISG110E NO ACTIVE SYSTEMS FOUND IN THE GRS COMPLEX. REACTIVATE
             SHOULD BE ATTEMPTED IF THERE ARE NO ACTIVE GRS SYSTEMS
             IN OPERATION. REACTIVATE MUST NOT BE ATTEMPTED IF THERE
             ARE ACTIVE SYSTEMS.
     ISG111D CONFIRM REACTIVATE SHOULD BE ATTEMPTED - REPLY NO OR YES
    

   • These messages indicate that SYS2 has the most current resource information of all the quiesced systems and has thus accepted the command.
4. Before replying to ISG111D, verify the following:
   1. The complex contains no ACTIVE or INACTIVE system.
   2. All required links are operational.
   3. No system has been temporarily stopped since SYS2 was quiesced.

   Also, contact the system programmer, describe the problem, and ask if a complex-wide IPL should be done. If the complex-wide IPL is preferable, reply NO to message ISG111D.

1. The following steps assume that reactivation is to continue.
   On SYS2, reply YES to message ISG111D. Some of the following messages appear:

       
     ISG112I SYSTEM SYS3 RESPONDED WITH GLOBAL RESOURCE STATUS -- IT
             WILL BE PERMITTED TO RESTART AFTER REACTIVATE COMPLETES    

   • This message indicates that the system is responding and does not have the most current information about global resources.

       
     ISG114I RESOURCE STATUS NOT RECEIVED FROM SYSTEM SYS4 -- IT MUST
             BE STOPPED BEFORE CONFIRMING REACTIVATE COMPLETION    

   • This message indicates that the system is responding but did not supply information about global resources. The system might have more current information, but it cannot reactivate the complex. (Only systems that include MVS/SP Version 2.2 with the fix for APAR OY13087 can reactivate the complex.) The operator must make sure the system is stopped before proceeding.

       
     ISG113I NO RESPONSE RECEIVED FROM SYSTEM SYS1 - IT MUST BE
             STOPPED BEFORE CONFIRMING REACTIVATE COMPLETION
    

   • This message indicates that the named system did not respond. In this case, this message confirms that SYS1 has failed. In other cases, the operator must investigate the state of the named system and make sure the system is stopped before proceeding.

       
     ISG115I IF ANY SYSTEMS WERE NOT LISTED IN THE PREVIOUS LIST,
             THEY ARE UNKNOWN TO THIS SYSTEM - THEY MUST BE STOPPED
             BEFORE CONFIRMING REACTIVATE COMPLETION
     ISG116E STOP INDICATED SYSTEMS BEFORE CONFIRMING REACTIVE
             COMPLETION. REPLY NO TO CANCEL REACTIVATE
     ISG117D CONFIRM REACTIVATE SHOULD BE COMPLETED - REPLY NO OR YES
    

   • These messages warn the operator to make a final check before allowing the reactivate process to complete. At this point, you could verify, for example, that no system had joined the complex after SYS2 was quiesced but before SYS1 failed.

     Message ISG112I, ISG113I, or ISG114I must appear for every system in the complex. If there is no message for a system, investigate the reason before proceeding. If you find any problems, reply NO to message ISG117D to stop reactivation.

1. The following steps assume that reactivation is to complete.
2. On SYS2, reply YES to message ISG117D. The following message indicates that SYS2 is now an active system:

       
     ISG118I REACTIVATE FUNCTION IS COMPLETE. SYSTEM SYS2 HAS    
             RESTARTED AS A RING OF ONE SYSTEM.    

   On SYS2, enter the following to complete the recovery:

   1. VARY GRS(SYS1),PURGE to purge SYS1 from the complex
   2. VARY GRS(SYS4),PURGE to purge SYS4 from the complex
   3. VARY GRS(SYS3),RESTART to bring SYS3 back into the complex
3. On SYS1, determine the problem, fix it, then reIPL the system with GRS=JOIN.
4. On SYS4, reIPL the system with GRS=JOIN.

At this point, the recovery process is complete.