For a number of years I've let the catalog and/or SMS supply the unit, but I've supplied unit count (ex: UNIT=(,3) ) to overlap I/O and mount processing. I even use it with virtual tape systems that have physical tape backup - because it can allow a recall of a virtual volume to be done while I/O is processing. But I never noticed until know that if you concatenate two DDs like this:
//SORTIN DD DISP=SHR,BUFNO=60, // UNIT=(,2), // DSN=dataset.one // DD DISP=SHR,BUFNO=60, // UNIT=AFF=SORTIN, // DSN=dataset.two and 'dataset.one' only has one volume, the system will issue a mount for that volume, and then one for volume 'PRIVAT', it won't mount the first or only volume of the second dataset. Is this behavior something that can be modified with some obscure JCL or system setting, or is this a candidate for an RFE? I'm making the assumption that physical tape hasn't reached the point where it isn't used anywhere, of course. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
