When VLF notification is automatic

Notification to VLF is automatic when both of the following are true:

• VLF runs on a sysplex. Each VLF that is active on a sysplex automatically receives notification of changes to shared data. When one system in the sysplex changes data, each VLF that is active on the sysplex and that shares the changed data is automatically informed of the change. See z/OS MVS Setting Up a Sysplex for more information about setting up VLF to run on a sysplex.
• The changed data is in a PDS class. Additionally, the change to the PDS data must have been made by either:
  • A program that uses IBM® data management services
  • A program that provides notification of the change to one of the systems by issuing the COFNOTIF macro.