Example of automatic restart

For this example, the operator actions assume a fully-connected four-system complex. Assume that SYS1 failed and that SYS2 detected the failure. Assume also that GRSCNFxx specified RESTART(YES) and REJOIN(YES) for all four systems.

On all other systems, the following message appears:

    
  ISG023E GLOBAL RESOURCE SERIALIZATION HAS BEEN DISRUPTED - GLOBAL
          RESOURCE REQUESTORS WILL BE SUSPENDED

This message indicates that an error has disrupted ring processing, though it does not pinpoint the source of the error. All active systems become inactive; any task that tries to obtain or free a global resource is suspended. All systems then attempt to restart the complex, but only one coordinates the process. In this example, assume that SYS2 is the system that will recover the complex.

On SYS2, the system coordinating the complex recovery, the following message indicates that automatic restart has begun:

    
  ISG024I SYSTEM SYS2 INITIATED AUTO RESTART PROCESSING

On SYS3 and SYS4, the following message appears:

    
  ISG025E SYSTEM sysx UNABLE TO INITIATE AUTO RESTART
          PROCESSING - PERMISSION GRANTED TO SYS2

This message, where sysx is SYS3 or SYS4, indicates that this system has given permission to SYS2 to rebuild the complex. It is a message that the operators should expect to see during automatic restart processing. It normally requires no operator action.

As SYS2 rebuilds the complex, assuming that SYS3 and SYS4 rejoin the complex in that order, the following messages appear as each system rejoins the complex.

On SYS2:

    
  ISG011I SYSTEM SYS2 - RESTARTING GLOBAL RESOURCE SERIALIZATION
  ISG013I SYSTEM SYS2 - RESTARTED GLOBAL RESOURCE SERIALIZATION
  ISG011I SYSTEM SYS3 - RESTARTING GLOBAL RESOURCE SERIALIZATION
  ISG013I SYSTEM SYS3 - RESTARTED GLOBAL RESOURCE SERIALIZATION
  ISG011I SYSTEM SYS4 - RESTARTING GLOBAL RESOURCE SERIALIZATION
  ISG013I SYSTEM SYS4 - RESTARTED GLOBAL RESOURCE SERIALIZATION

On SYS3:

    
  ISG011I SYSTEM SYS3 - RESTARTING GLOBAL RESOURCE SERIALIZATION
  ISG013I SYSTEM SYS3 - RESTARTED GLOBAL RESOURCE SERIALIZATION
  ISG013I SYSTEM SYS4 - RESTARTED GLOBAL RESOURCE SERIALIZATION

On SYS4:

    
  ISG011I SYSTEM SYS4 - RESTARTING GLOBAL RESOURCE SERIALIZATION
  ISG013I SYSTEM SYS4 - RESTARTED GLOBAL RESOURCE SERIALIZATION

Global resource serialization has recovered the complex automatically without operator intervention. The recovered complex consists of SYS2, SYS3, and SYS4.