z/OS MVS JCL Reference
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z/OS MVS JCL Reference

If you do not specify MGMTCLAS for a new data set and the storage administrator has provided an installation-written automatic class selection (ACS) routine, the ACS routine may select a management class for the data set. Check with your storage administrator to determine if an ACS routine will select a management class for the new data set, in which case you do not need to specify MGMTCLAS.

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