Radoslaw wins on points. A preoccupation with having a first PDS member begin on a notional track boundary of an emulated device strikes me as misplaced, even bizarre; but it would be my guess that it is also benign.
To take it seriously for the moment, It is achievable by calculating the number D of directory blocks that fit on an emulated 3390 track and then always allocating some integral multiple of D directory blocks. (This calculation is trivial, but I have suppressed its result here to avoid encouraging its misuse.) I do not myself think initial-member track alignment should be sought. What was perhaps optimal for a spinning physical 3390 DASD will only adventitiously be optimal or even appropriate for an emulated one. John Gilmore, Ashland, MA 01721 - USA ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
