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Location in the JCL z/OS MVS JCL Reference SA23-1385-00 |
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When a DD statement contains a UNIT=AFF=ddname parameter, the DD statement referenced in the AFF subparameter must be defined earlier in the job step; otherwise, the system treats the DD statement containing UNIT=AFF as a DD DUMMY statement. The following example illustrates a case where the system treats
the DD statement containing the UNIT=AFF as a DD DUMMY statement:
DD3 requests unit affinity to DD1. Although DD1 occurs earlier in the job step than DD3, it refers to DD5 that is located after DD3. Because DD1 is not completely defined, the system treats DD3 as a dummy statement. |
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