If you are running multiple z/OS systems and sharing the control data set and journal, ensure that you have specified a unique SYSID for each system.

If you suspect that there is an error in the DFSMSrmm control data set, you can use the DFSMSrmm EDGUTIL utility to verify the contents of the DFSMSrmm control data set. Then use the DFSMSrmm ISPF dialog or the RMM TSO subcommands to correct the control data set. To find and correct errors in the control data set, perform these steps:

1. Run the utility EDGUTIL with the VERIFY parameter to check the contents of the control data set. For example, EDGUTIL checks to see that a volume is associated with a rack number and that the rack number exists. If the rack number does not exist, then EDGUTIL writes a message to the SYSPRINT data set.
2. Inspect the SYSPRINT data set to determine which records you need to correct.
3. Correct DFSMSrmm control data set records using the RMM TSO subcommands by deleting incorrect information and adding correct information.

Related Reading: For information on the RMM TSO subcommands, see z/OS DFSMSrmm Managing and Using Removable Media.

For example, if the EDGUTIL utility detects that a volume resides in a rack number but the rack number does not exist, you can follow these steps to correct the problem.

1. Use the RMM SEARCHDATASET subcommand with the CLIST operand to create a list of data sets.

   RMM SEARCHDATASET VOLUME(volser) CLIST('RMM LISTDATASET ')

   Save the output from the request to use when you issue the RMM ADDDATASET subcommands as described in step 5.
2. Use the RMM DELETEVOLUME subcommand to remove the volume from DFSMSrmm. Use the REMOVE operand to delete a scratch volume from the control data set. Use the RMM DELETEVOLUME subcommand with the FORCE operand to delete a master volume from the control data set.

   You can also change volume information by using the RMM CHANGEVOLUME FORCE command. To use the FORCE operand, you must have CONTROL access to STGADMIN.EDG.MASTER security resource and UPDATE access to STGADMIN.EDG.FORCE security resource.

3. Before adding the volume to DFSMSrmm, use the RMM ADDRACK subcommand to add the rack number.
4. Use the RMM ADDVOLUME subcommand to add the volume to the DFSMSrmm control data set with the correct rack number.
5. If the volume had any data sets on it, you should issue one RMM ADDDATASET subcommand for each data set.

If you still have a problem with your control data set, report the problem and all the messages produced by EDGUTIL to the IBM® Support Center.

You can also restore your DFSMSrmm control data set with a backup copy of the control data set and journal.

Related Reading: Before attempting the restore, see z/OS DFSMSrmm Implementation and Customization Guide.