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Allocating External Files

Allocating External Files on Tape

Tapes are used primarily in batch mode; in fact, some sites might restrict or prohibit tape mounts in interactive sessions. Because file allocation for external files on tape is done infrequently, the FILENAME statement and FILENAME function give only limited support for parameters that are normally associated with data sets on tape. However, you can use the FILENAME statement or FILENAME function to allocate a cataloged tape file, provided that you specify the data set name and disposition (as you would normally do in a JCL DD statement). To allocate an uncataloged tape file, do the following:

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