>>I have a REXX which will reallocates an ISPF.PROFILE dataset if the 
allocation sizes are below what is needed for the latest "got to have" 
product. 

There is a line in this REXX line in the code which allocates the new 
ISPF.PROFILE dataset with "SPACE(45 15) TRACK".  If the target volume 
group in the UNIT parameter is SMS managed the allocated size is reduced 
to 38,15.  If it is not SMS managed, this allocated size is 45,15.  The 
SMS Storage class has "reduce % on allocation failure" of 0.  (Nothing in 
data classes modifies allocation size). 

>>I don't understand how it is getting reduced to 38 from 45.  Ideas?
>>>>>>>>>>>>>>>>>>>>>>>

Have you looked at the dataset extents? The primary allocation can use 
more than 
physical extent to satisfy the allocation.  If your SMS pools are more 
fragmented 
than your non-SMS volume, the allocation might be made across more than 1 
physical allocation.

HTH's
dd keller



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