Starting duplexing for a structure

When duplexing starts, a period exists in which activity to the structure is quiesced. For this reason, you should start duplexing during a period of low activity in the system.

About this task

While duplexing is being established, and for the entire time duplexing is in effect, a display of the structure shows the structure as being in DUPLEXING REBUILD. The rebuild phase is called DUPLEX ESTABLISHED, which means that duplexing is truly active for the structure.

Procedure

To start duplexing for a structure:

Complete one of the following actions:
  • Activate a new CFRM policy with DUPLEX(ENABLED) for the structure. The structure must have one or more actively-connected Db2 instances that support duplexing, and no connectors that do not support duplexing. If the structure is currently allocated, z/OS® can automatically initiate the process to establish duplexing as soon as you activate the policy. If the structure is not currently allocated, the duplexing process can be initiated when the structure is allocated.
  • Activate a new CFRM policy with DUPLEX(ALLOWED) for the structure. If the structure is currently allocated, use the following command to start the duplexing rebuild: 
    SETXCF START,REBUILD,DUPLEX,STRNAME=strname

    If the structure is not currently allocated, wait until it is allocated before starting the duplexing rebuild.