application folks have a data set that is allocated as:

//DD1  DD DSN=app.data,              
//           DCB=(LRECL=567,BLKSIZE=27783,RECFM=FB),      
//           SPACE=(CYL,(1,10)),DISP=(,catlg)


later on, they use this data set as output to a syncgener step as:

//COPY1.SYSUT2  DD DSN=app.data,              
//           DCB=(LRECL=567,BLKSIZE=27783,RECFM=FB),      
//           SPACE=(CYL,(300,50)),DISP=OLD,UNIT=(SYSDA,59) 

aside from the obvious things you may comment on, when this data set is
accessed in the second step, allocation wise, isn't the only thing that gets
a temporary bump the secondary allocation from 10 to 50 ? The primary will
still be 1, yes ? 
They had an SB37-04 last night on a volume that only had 280 free cylinders,
I think they had already hit 16 extents on the data set not that the primary
couldn't be filled. No way to check since they deleted it and reallocated it
at (400,100)

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