Stopping duplexing for a structure

If you need to stop duplexing, you must first decide which instance of the structure is to remain as the surviving simplexed structure.

About this task

If you have a choice, use the primary structure as the surviving one. For example, the primary group buffer pool has intact page registration information. If you choose the secondary group buffer pool—which does not have intact page registration information—as the surviving structure, all this information is lost. As a result, all locally cached pages revert to an invalid state and these pages must then be refreshed from the group buffer pool or disk.

Procedure

To temporarily switch to using one of the duplexed structures as a simplexed structure:

Optional: If DUPLEX(ENABLED) is specified for the active CFRM policy, activate a new policy specifying DUPLEX(ALLOWED). For the new DUPLEX value to take effect, all other CFRM policy parameters must remain unchanged.
Use the SETXCF STOP,REBUILD command, specifying KEEP=OLD to use the primary structure as a simplexed structure, or specifying KEEP=NEW to use the secondary structure as a simplexed structure.
For example, the following command reverts to using the primary structure as the simplexed structure:
```
SETXCF STOP,RB,DUPLEX,STRNAME=strname,KEEP=OLD
```

What to do next

If you do not plan to reestablish duplexing for the structure in the near future, activate a new CFRM policy specifying DUPLEX(DISABLED) for the structure. Doing so, permanently switches to using one of the duplexed structures as a simplexed structure.

If you want to perform maintenance on a coupling facility that contains primary or secondary structure instances, use the SETXCF STOP,RB,DUPLEX command and specify the target coupling facility.