z/OS DFSMS Using Data Sets
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Migrating from the Mass Storage System

z/OS DFSMS Using Data Sets
SC23-6855-00

Because MSS is no longer supported, you need to migrate the data off MSS. If you issue the ACQRANGE, CNVTAD, or MNTACQ macros, you receive a return code of 0 and a reason code of 20, that means these macros are no longer supported.

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