z/OS TSO/E Customization
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Example of default space allocation

z/OS TSO/E Customization
SA32-0976-00

The following illustrates an example of default space allocation. Suppose an existing data set has the following characteristics:
  • Contains 6000 records
  • 200 additional records are to be copied into the data set
  • Each record contains 120 characters
The primary space calculation (number of 4K blocks) is: 
2 ((((6000 + 200) 120)/4096) +2) = 366
The secondary space calculation (number of 4K blocks) is: 
366/2 = 183

The utility work data set has a capacity of approximately 18,600 records.

Parent topic: Default space allocation

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