AFAIK you cannot reliably find the primary allocation. You can interpret the dataset extents, and assume the first extend is the primary allocation, but that's likely to be misleading. For example, if you requested (2000,10) cylinders, and the volume had three 1000 cylinder extents available, the first extent for the data set would be 1000 cylinders, and the second would be 1000 cylinders. Assuming the dataset needed additional space, the third extent would be 10 cylinders.
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