For an undefined record format file; The blocksize from the dscb is the maximum blocksize for that dataset. You would getmain a buffer of that size for use by a GET move mode macro. The actual size of the block retrived is returned in the DCB lrecl field. It can theoretically be equal to or smaller than the blocksize that the file was written with. See DFSMS Macro Instructions for Data Sets - nonvsam GET macro.
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