>I'm still intrigued that the (undocumented) option's name
>contains the substring "32G". 

Use2GTo32G: "Satisfy this request for n 1M segments using storage in the 
range 2G to 32G."

>At some release 64-bit LE moved the CAA and other control blocks from
>starting at 4G to 32G. 

I suspect this isn't true. LE has no control whatsoever over the "origin" 
(address returned by IARV64) which determines the address at which its 
above-2G blocks are placed. But RSM's giving the range 2G to 32G to Java 
likely meant that when LE requested storage from IARV64, it no longer was 
given an address "as low as" 4G.

Peter Relson
z/OS Core Technology Design

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