Use the VLPOOL command in the EDGRMMxx parmlib member to change pool definitions. See Defining pools: VLPOOL for information about using the VLPOOL command.

If you change a pool definition that include racks defined to an existing pool, you might need to redefine the shelf locations or volumes to DFSMSrmm. To redefine the shelf locations or volumes when the media name for the new pool does not match the existing pool, use the RMM subcommands or DFSMSrmm ISPF dialog to change information. For example, to redefine the shelf locations and volumes, perform these tasks:

1. Add or alter the VLPOOL statements in parmlib and refresh the DFSMSrmm parameters.
2. Add rack numbers for the new VLPOOL prefixes and those with changed MEDIANAMEs.
3. Issue the RMM CHANGEVOLUME volser MEDIANAME for each volume affected.
4. Delete the old rack numbers specifying the old MEDIANAME.

See z/OS DFSMSrmm Managing and Using Removable Media for more information about using the RMM subcommands or the DFSMSrmm ISPF dialog to change the pool definitions.