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Reference.org
Data Facility Storage Management Subsystem (MVS)
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<p>Data Facility Storage Management Subsystem (DFSMS) is a central component of <a href="/facts/IBM/QszA7nwd">IBM</a>'s flagship operating system <a href="/facts/Z%2fOS/amLCAlgV">z/OS</a>. It includes access methods, utilities and program management functions. <i>Data Facility Storage Management Subsystem</i> is also a collective name for a collection of several products, all but two of which are included in the DFSMS/MVS product. </p>