So many assumptions.
1. USS doesn't use volumes, it uses (mostly) MVS data sets to contain
file-systems.  These are created/defined with MVS methods.
2. The filesystems can be in either HFS or ZFS data sets.  HFS data sets
won't "grow" like ZFS data sets can.
3. IF using ZFS, then some of the previous replies may help you.

The manual to start with is
GA32-0884-30 z/OS UNIX System Services Planning

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