So for a 200 cylinder checkpoint CA Deliver requires 70.32M worth of storage. So why all this storage. Well a 200 cylinder checkpoint has 18,000 blocks. Each block is 4,096 byies. 18000 times 4096 is 73,728,000 bytes. That divide by 1M (1024*1024) is 70.3125M. So you can do a RMODBASE status and get the number of checkpoint blocks, multiple that by 4096, and divide by 1M (1,048,576) and that is the basic storage requirement. There is some additional storage need besides that but small compared with that amount.
For a 100 cylinder checkpoint we will need 35.15M worth of storage
So an increase in Checkpoint file may require an increase in TSO users storage allocation