z/OS DFSMS Managing Catalogs
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Enabling SYS% Conversion

z/OS DFSMS Managing Catalogs
SC23-6853-00

The setting for the SYS% facility ("on" or "off") is set in the SYSCATxx member of SYS1.NUCLEUS. You can change this setting without an IPL by using the MODIFY CATALOG operator command: 
   MODIFY CATALOG,SYS%ON   or MODIFY CATALOG,SYS%OFF

Using the MODIFY command, you can use the SYS% facility selectively, only turning it on when you need it. See Identifying the Master Catalog and Initial Configuration (SYSCATxx) for information on activating the SYS% facility at IPL.

Parent topic: Using the SYS% Conversion Facility

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