On 6/10/2013 12:15 PM, Blaicher, Christopher Y. wrote:
I am not a LUW person, other than I use a windows machine for simple things, so I am curious how external storage is allocated and controlled in that environment. I think we have all heard the complaints about the short-comings of MVS in this area, but what would be a realistic solution?
Technically the easiest to implement would be adding a new device type, thus keeping (E)CKD completely distinct from FBA. The new type could be supported by VSAM/AMS only (and JCL, SVC 99, etc.) without impacting other programs. (I would hope there are no programs out there using TM UCBTBYT3 rather than CLI?)
I would imagine the people at IBM have spent a little time on this, and if it was easy would have started transitioning us from ECKD to 'the new way' a long time ago. The idea of a 'run-away' program is what is the hang-up.
I cannot see IBM spend any effort on this unless one of the Fortune 10 companies requires it. Even then I would expect them to stick with the pre-allocated space paradigm rather than transitioning. As to run-away programs, they should be thoroughly checked on a test system before going into production; a run-away in production should be so rare as to be immaterial.
Gerhard Postpischil Bradford, Vermont ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
