>There are tremendous advantages to keeping the 3390 geometry stable.

YES!

>You might not remember how much hassle it was in the past to transition from 
>e.g., 3330 to 3350, to 3380, to 9345 (for some of us), to 3390.

OH! YES!
I missed the 9345, but the rest hurt!
Remember 3390 in '3380-compatability'?


>Over two decades ago, IBM promised there would be no 

Etc. Etc. &c!

One of the best promises!

Until FBA/SDB comes out in z/OS, there is nothing better to do.

By SDB, I mean when people stop worrying about Block Size, and embrace it.
I know some who still insist on coding it!

-
Too busy driving to stop for gas!

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