In V2R3, the 1M LFAREA specification  is a limit and not a reservation as 
it was in prior releases.    From the Init and Tuning Reference: 

xM or xG or xT
Specifies the maximum amount of online real storage that can be used to 
satisfy fixed 1 MB page
requests. Up to six decimal digits can be specified for x: xM specifies 
the amount is in megabytes;
...


The 2G LFAREA specification has not changed and is still a reservation. 
>From the Init and Tuning Reference: 

2G=(a)
Specifies the number of 2 GB pages of online real storage to reserve in 
the large frame area. Up to...



Harris Morgenstern
z/OS Storage Management and System REXX
Dept. OBPA
IBM Poughkeepsie
8-295-4221 
[email protected]


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