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CP Level OS/DOS Data Set Considerations

In DORMANT mode with the SIOCHK option specified, CP level OS/DOS data set protection might deny access to a resource (or fail an I/O request) if it is unable to determine the resource being accessed. Test this feature with potentially incompatible applications before it is enabled in production. Some guest systems will require ACIDs with special attributes when this option is selected.

For information on the SIOCHK option, see the Implementation Guide.