Recovery actions for a two-system complex if SYS1 fails

On SYS2, the following messages appear:
```
    
 ISG023E GLOBAL RESOURCE SERIALIZATION HAS BEEN DISRUPTED - GLOBAL
         RESOURCE REQUESTORS WILL BE SUSPENDED
 ISG025E SYSTEM SYS2 UNABLE TO INITIATE AUTO RESTART
         PROCESSING - THIS SYSTEM IS NOT AUTHORIZED
 
```
- These messages indicate that an error disrupted ring processing, and that SYS2 is not authorized to restart the complex automatically. SYS2 becomes inactive; any task that tries to obtain or free a global resource is suspended. Suspended tasks will quickly degrade performance on both systems.
On SYS2, enter VARY GRS(ALL),RESTART.

On SYS2, the following messages appear:

    
 ISG026I SYSTEM SYS2 MAY CREATE A SPLIT RING IF ANY OTHER GRS
         SYSTEM IS ACTIVE. VERIFY THAT NO GRS SYSTEM IS ACTIVE
         BEFORE CONFIRMING RESTART
 ISG027D CONFIRM RESTART RING FOR SYSTEM SYS2 - REPLY NO OR YES

Before replying to message ISG027D, enter DISPLAY GRS or check with the other operator to verify that SYS1 is not active.
- If SYS1 is inactive, reply YES to continue the restart.
- If SYS1 is active, reply NO to avoid a split ring.
On SYS2, reply YES to message ISG027D (assuming that SYS1 is inactive). The following messages appear:
```
    
 ISG011I SYSTEM SYS2 - RESTARTING GLOBAL RESOURCE SERIALIZATION
 ISG013I SYSTEM SYS2 - RESTARTED GLOBAL RESOURCE SERIALIZATION
 
```
On SYS2, determine if the failure on SYS1 requires reIPL of SYS1 or if operator action stopped SYS1 temporarily.
If the failure is temporary, no further action is needed. When SYS1 resumes processing, it automatically rejoins the complex because REJOIN(YES) was specified on both systems. The following message appears:
```
    
 ISG012I RESTART REQUEST PASSED TO SYS2
 
```
The following messages appear on both systems when SYS1 rejoins the complex:
```
    
 ISG011I SYSTEM SYS1 - RESTARTING GLOBAL RESOURCE SERIALIZATION
 ISG013I SYSTEM SYS1 - RESTARTED GLOBAL RESOURCE SERIALIZATION
 
```

If the failure requires reIPL of SYS1, do the following:
1. On SYS2, enter VARY GRS(SYS1),PURGE to remove SYS1 from the complex. The following messages might appear:
```
    
 ISG017D CONFIRM PURGE REQUEST FOR SYSTEM SYS1 - REPLY    
         YES OR NO    
```
  Reply YES. The following message appears:
```
    
 ISG011I SYSTEM SYS1 - BEING PURGED FROM GRS COMPLEX    
```
2. If the following appears before ISG013I, the message indicates a possible data integrity exposure.
```
    
 ISG016I SYSTEM SYS1 OWNS OR IS WAITING FOR GLOBAL RESOURCES    
```
  Notify the system programmer. Give the system log to the system programmer. The system log normally contains messages about the problem. The following message describes any resources that might have been damaged by purging the system:
```
    
 ISG018I REQUESTORS FROM SYSTEM SYS1 HAVE BEEN PURGED FROM
         RESOURCES NAMED xxxx,yyyy    
```
3. On SYS1, reIPL the system with GRS=JOIN.
4. On both systems, the following messages appear when SYS1 rejoins the complex:
```
    
 ISG011I SYSTEM SYS1 - JOINING GRS COMPLEX
 ISG004I GRS COMPLEX JOINED BY SYSTEM SYS1
 
```