Consider the following dasd statistics:

Using 961 test vsam datasets ("A48TV") as a sample, the current vsam
allocation is 365,685 tracks.  Converting to IAM would reduce this
amount to 193,889, a savings of 46%.
Totals saving in dasd = 11,095 cylinders = 4.98 volumes

Using 177 vsam datasets ("A1") as a sample, the current vsam
allocation is 16,094 tracks.  Converting to IAM would reduce this
amount to 7,545, a savings of 47%.
Totals saving in dasd = 453 cylinders 

Using 82 vsam datasets ("A74") as a sample, the current vsam
allocation is 38,782 tracks.  Converting to IAM would reduce this
amount to 11,575, a savings of 69%.
Totals saving in dasd = 1717 cylinders 

Using 37 vsam datasets ("A5") as a sample, the current vsam
allocation is 4,449 tracks.  Converting to IAM would reduce this
amount to 2,025, a savings of 50%.
Totals saving in dasd = 133 cylinders

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