I dont have any more information than others about this R13 new function.... However... Allocation and ENQ processing are not changed. So you should expect all specified volumes to be ENQd and serialised until used. At EOV, the used volume will be DEQd. Another job that specifies the same volume list would have to wait until CLOSE time and the last volume is DEQd to get going. So whats the benefit?
Also look at a related new function 'LABAN exit enhancement for multi-volume'. This is exploited by rmm in R13. You specify a single volume of a set, or an incomplete list of volsers.... at OPEN time the wrong sequence is detected and your tape management system can provide the correct list of volsers. I dont know, and no longer have a way to test this, but could this be a way to avoid the serialisation of all volumes at the start? For a complete answer best go to IBM and hope they ask the developer. Mike Wood ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
