Updating system data sets during tracking

Before you make a system change to an XRF-capable IMS subsystem, you must identically update the equivalent data set on the other subsystem in the XRF complex.

Update the following system data sets:

• IMS.ACBLIBA and IMS.ACBLIBB
• IMS.FORMATA and IMS.FORMATB
• IMS.MODBLKA and IMS.MODBLKB
• IMS.TFORMATA and IMS.TFORMATB

You can perform identical updates on both subsystems using an IMS restart or the Online Change Copy utility (DFSUOCU0). Use one set of staging libraries for both subsystems; a staging library is not a single point of failure because the online subsystem does not use it. After you have ensured that the inactive data sets on both subsystems are identical in content, use the /MODIFY PREPARE, /DISPLAY MODIFY, and /MODIFY COMMIT commands on the active subsystem. After these changes are committed on the active subsystem, the alternate subsystem automatically reprocesses the online change sequence.