Running IRRMIN00 when PARM=NEW is specified

When you specify PARM=NEW, the RACF® database initialization program (IRRMIN00) formats a non-VSAM DASD data set so that it can be used as a RACF database.

You must run IRRMIN00 with PARM=NEW during the initial installation of RACF to format the RACF database. After RACF is installed, you can run IRRMIN00 with PARM=NEW to format an alternate RACF database.

If you attempt to run IRRMIN00 with PARM=NEW for a RACF data set that is active on the system from which you are running the utility, IRRMIN00 issues an error message and ends. This behavior prevents you from overwriting a RACF data set that is active on the system. It does not, however, prevent you from overwriting a RACF data set that is inactive on the the system from which you are running, but active on another system.

Attention:

Do not run IRRMIN00 PARM=NEW against an existing RACF database unless you do not need the data in that database. PARM=NEW processing destroys all existing data as it formats an empty database for you.
When formatting a database with PARM=NEW, the database must not be active on any system.

The IRRMIN00 program divides a RACF database into 4K records. When you create a new RACF database, the following records are initialized:

Record: Description
ICB: The header block (inventory control block).
Templates: The user, group, data-set, and general template definitions, the alias-related template extension, plus five reserved blocks.
Segment table block: Segment definitions from within a template.
BAM blocks: BAM (block availability mask) blocks are initialized with the space configuration for the database.
Empty blocks: Available for later use as profile blocks or index blocks.

Note: No profile or index blocks are initialized.