I am investigating the use of catalogued tapes. We have created one such and you can see it with ISPF 3.4, although line commands are prohibited . The existing code I am working with dynamically allocates the DSN on the tape, reads the JFCB and then issues the OBTAIN macro to get DSCB information. However, with a DSN on a tape volume you always get RC=4, "Volume not mounted" (the TSO LISTDSI command tells you the same thing). But of course, the tape *is* mounted. I can run IEBGENER and copy the DSN, so what is the correct technique in this situation. I have a dim memory that OPEN TYPE=J is useful but would be grateful for any suggestions.
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