z/OS Security Server RACF System Programmer's Guide
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UCBs above 16MB

z/OS Security Server RACF System Programmer's Guide
SA23-2287-00

You can define unit control blocks (UCBs) above 16MB and:
  • Place the RACF® database on these devices.
  • Use RACF to protect data sets on these devices.

See z/OS HCD Planning for more information.

Parent topic: Operating considerations

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