To enable stacked volume support, perform these tasks:

1. Update all systems sharing a control data set to the level of code that contains stacked volume support.
2. Correct any information about stacked volumes that you have defined to DFSMSrmm before running the DFSMSrmm EDGUTIL utility. EDGUTIL changes the volume type to stacked but does not set the correct location information for the volume. You can set the correct volume type and location information prior to running EDGUTIL MEND using the RMM CHANGEVOLUME subcommand. Figure 1 shows an example of how you can use the RMM SEARCHVOLUME subcommand to build a CLIST that can be used to change volume information. Specify operands that are based on the way that you have defined volumes to DFSMSrmm. Then run the CLIST produced by the command to make changes to the volumes.
   Figure 1. Changing volume type and volume location

   RMM SEARCHVOLUME VOLUME(ST*) OWNER(*) LIMIT(*) -
       CLIST('RMM CHANGEVOLUME ','TYPE(STACKED) LOCATION(vts_name) NORACK')

3. Run the EDGUTIL utility with UPDATE with the STACKEDVOLUME(YES) operand on the CONTROL statement of the SYSIN file to enable stacked volume support.
4. To check the stacked volume information, you can use EDGUTIL with VERIFY(VOLUME) to check whether the container information is correct. Use the RMM LISTCONTROL CNTL subcommand to display the status of support. DFSMSrmm marks the support status as MIXED if there is any container information in the control data set volume records. If the support status shows MIXED, you can run EDGUTIL MEND as described in Mending the control data set to make the container information consistent. During MEND processing, DFSMSrmm creates the necessary stacked volumes if you have not previously defined them using the DFSMSrmm subcommands.
5. Run EDGHSKP storage location management processing to clean up location and bin number information in volumes that are in a container.