To disable RACF®, update the appropriate IFAPRDxx member and change the STATE field for the Security Server to:

STATE(DISABLED)

Then re-IPL the system to make the change take effect.

For example, update the IFAPRDxx entry to look like this:

PRODUCT OWNER('IBM CORP')
        NAME('Z/OS')
        FEATURENAME('Security Server')
        ID(5694-A01)
        VERSION(*)
        RELEASE(*)
        MOD(*)
        STATE(DISABLED)