Using the extended address volume (EAV) migration assistance tracker

The EAV migration assistance tracker can help you find programs that you might need to change if you want to support extended address volumes (EAV). The EAV migration assistance tracker is an extension of the console ID tracking facility. It helps you:

Identify select systems services by job and program name, where the invoking programs might require analysis for changes to use new services. The program calls are identified as informational instances for possible migration actions. They are not considered errors, because the services return valid information.
Identify possible instances of improper use of returned information in programs, like parsing 28-bit cylinder numbers in output as 16-bit cylinder numbers. These instances are identified as warnings.
Identify instances of programs that will either fail or run with an informational message if they run on an EAV. These are identified as programs in error. The migration assistance tracker flags programs with the following functions, when the target volume of the operation is non-EAV, and the function invoked did not specify the EADSCB=OK keyword:
- OBTAIN
- CVAFDIR
- CVAFSEQ
- CVAFDSM
- CVAFFILT
- CVAFVSM - Note that the CVAFVSM interface is an internal system function that is not documented externally for general use.
- OPEN of VTOC
- DCB OPEN of an EAS eligible data set
This allows the system programmer to identify programs in error by job and program name, without failing the programs. It also allows you to exclude programs that are not yet ready for evaluation.
Programs identified in this phase of migration assistance tracking will continue to fail if the system service is issued for an EAV if you do not specify the EADSCB=OK keyword for them.

The EAV migration assistance tracker can be manipulated with the following commands:

The SETGTZ operator command, which is used to activate and deactivate the tracking facility.
The DISPLAY GTZ[,STATUS] operator command, which is used to display the current status of the tracking facility.
The DISPLAY GTZ,TRACKDATA operator command, which is used to display any recorded instances of violations.
The GTZPRMxx dynamic parmlib member, which is used to list violations that have already been identified in order to prevent them from being recorded again.

See console ID tracking facilityconsole ID tracking facility in z/OS MVS Diagnosis: Tools and Service Aids for more information.

The following describe the instances identified and recorded by the EAV migration assistance tracker: