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What is the largest possible Z/OS dataset allocation at the moment? That's not easily answered. But assuming and Extended Format dataset with VOL=(,,,59) and 1TB empty volumes it's a Z/OS hard limit of ~59TB for a dataset. That is a long way from from a PB through to YB! Good to future proof though if feasible.
It would be useful for ISPF 3.4 to show an option KB, MB, GB etc value as opposed to just Total TRKS though.
Creating a new RFE based on Community RFE #93348 in product z/OS.