Upgrading a log stream from DASD-only to coupling facility

You can upgrade a log stream defined as DASD-only (DASDONLY=YES parameter on the log stream definition) to a coupling facility log stream. Do this by issuing the IXGINVNT REQUEST=UPDATE service with the STRUCTNAME parameter to associate a structure with the log stream.

To upgrade a log stream from DASD-only to coupling facility, the following must be true:

The structure specified on the STRUCTNAME parameter must be defined in a structure definition in the LOGR policy.
All connections (active or failed) to the log stream must be disconnected.

Before connecting to or issuing any system logger services against an upgraded log stream, you must also make sure that the structure associated with the log stream is specified in the CFRM policy couple data set.

For guidance on upgrading a DASD-only log stream to a coupling facility based one, see the system logger chapter in z/OS MVS Setting Up a Sysplex.