Use the MEDINF command to define media characteristics for OEM media products. The MEDINF values convert external values for media type and recording technology to internal values when supplied in the DFSMSrmm TSO subcommand input, as well as externalizes recorded values in reports and DFSMSrmm TSO subcommand output. To connect a volume to a specific media information entry, assign the media information name with the RMM TSO subcommands ADDVOLUME and CHANGEVOLUME using the MEDINF operand.

If a volume has no media information assigned, the default media information name is IBM, and the internal IBM table is used. To override the use of the internal table for IBM media, you must define media information in your parmlib specifying a media information name for IBM. The internal IBM table continues to be used for any values that you do not specify for IBM media. The internal values cannot be changed for IBM media. The internal values you specify identify the external values and capacity you want to override.

The internal IBM table cannot be displayed. It contains entries for each of the permissible combinations of IBM media types and recording formats and includes published media capacities. For the list of available external values, refer to the MEDIATYPE and RECORDINGFORMAT operand descriptions for the ADDVOLUME and CHANGEVOLUME subcommands in z/OS DFSMSrmm Managing and Using Removable Media. The internal values are defined by the CBRTDSI mapping macro; for example, for MEDIA1/CST the internal value is 1.

There is no default media information entry.

Once you have defined MEDINF commands and assigned a non-IBM media information name to a volume, DFSMSrmm no longer automatically maintains the media type and recording format. Unless you also implement the EDG_EXIT300 installation exit, the media type and recording format for non-IBM media is only maintained manually.

Use the MEDINF command with operand REPLACE to define volume replacement policies.

/***************************************************************/
/*                                                             */
/*  RMM (HDZ1A10)   SAMPLE MEDINF PARMLIB COMMANDS             */
/*                                                             */
/*  MERGE THIS MEMBER INTO YOUR EDGRMMxx PARMLIB MEMBER        */
/*  AVOID REPLACE AND CAPACITY on SYNONYM ENTRIES unless the   */
/*  combination of internal numerical values is unique.        */
/*                                                             */
/*-------------------------------------------------------------*/
/* Global replace policy */
MEDINF NAME(STK) REPLACE(PERM(1))
/* 3480 cartridges */
MEDINF NAME(STK) MEDIATYPE(1,STANDARD) RECORDINGFORMAT(1,18TRACK) +
 CAPACITY(200)
MEDINF NAME(STK) MEDIATYPE(1,CST)    /* synonym */ +
                                       RECORDINGFORMAT(1,18TRACK)
MEDINF NAME(STK) MEDIATYPE(1,STANDARD) RECORDINGFORMAT(2,36ATRACK) +
 CAPACITY(400)
MEDINF NAME(STK) MEDIATYPE(1,CST)    /* synonym */ +
                                       RECORDINGFORMAT(2,36ATRACK)
MEDINF NAME(STK) MEDIATYPE(1,STANDARD) RECORDINGFORMAT(3,36BTRACK) +
 CAPACITY(400)
    :
    :  

The full sample is delivered in SYS1.SAMPLIB(EDGMEDST). Another sample, SYS1.SAMPLIB(EDGMEDOP), provides sample MEDINF commands for media available on open systems and ready to be used with IBM's Integrated Removable Media Manager for the Enterprise on System z (IRMM).