The DSCB (and OBTAINing it) is a DASD construct. For the equivalent with tape
you have to read sequentially looking for labels.
> Date: Tue, 2 Oct 2012 10:14:14 +0000
> From: robin.atw...@microfocus.com
> Subject: How to get a tape's DSCB
> To: IBM-MAIN@LISTSERV.UA.EDU
>
> 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.
>
> TIA
> -Robin
>
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