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RMS_DFMBFSMT is a system parameter that establishes the default RMS multibuffer count for magnetic tape operations. This value defines the number of I/O buffers that RMS allocates for magnetic tape files. You can set this system parameter with the DCL command SET RMS_DEFAULT/SYSTEM and display the parameter with SHOW RMS_ DEFAULT. RMS_DFMBFSMT is an AUTOGEN and DYNAMIC parameter.