Rick Fochtman wrote:
----------------------<snip>--------------------
One could enlarge those data set if a new unit type with larger
tracks would be defined.
I admit I'm too busy (lazy) right now to RTFM but would appreciate
any toughts on this (just curious). Why do we still keep the ~55k
track size and increase only the number of cylinders? With modern
DASD subsystems it shouldn't matter, right? What are the track size
limits in z/OS? I guess it's 64k, but still this would be 16% more.
---------------------<unsnip>-----------------------
You're right, but the downside is this: there are literally millions of
lines of JCL still in regular use that allocate space in terms of tracks
and cylinders. To change the length of a track would invoke nightmares
of geometry changes, which we all suffered through in pre-3390 days
whenever a newer DASD design hit the street. IT managers that remember
those days still cringe at the thought! Until all allocations are done
in terms of bytes, or multiples thereof, a geometry change will put
people into cold sweats. Old habits are hard to break; old nightmares
are hard to forget.
I disagree. Completely. Mainframe users had to do with different track sizes,
some dataceneters still have 3380 emulation.
There is also possiblity to use bytes/kbytes/Mbytes. It have been here for years. Since beginning of DFSMS.
JCL change shouldn't be a problem, it had to be done during previous model conversion, it can be done in the future. Last but not least: it *need not* to be done! You can set "default track size" in SMS. This mechanism can be further enhanced.
So, in fact no change is required. Even for jobs with hardcoded volsers.
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