I am finding hard to persuade some old time IBM developers that planning to disperse dataset allocation as if they were accessing old discreet 3390 disks is a futile effort. Ignoring that with PAV and WLM goal mode and 3390s only logical and no one really knows were all the pieces are stored on the much fewer physical disks emulating thousands of volumes. I suggest use SMS without requesting Guaranteed space and placing their datasets on specific volumes is not getting through to them. Please help direct me to some decent documentation explaining this. Also if anyone knows when this technique is still relevant I'd love to know. Also which RMF screen gives a good snapshot of IO activity (and caching) Thanks.
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