Great question — answering as the UphillTech team:
Looks like you have a quota set on that dataset. You can check it with zfs get quota zroot/jails/containers/gopher To clear the quota, run zfs set quota=none zroot/jails/containers/gopher From man zfsprops : quota=size|none Limits the amount of space a dataset and its descendants can consume. This property enforces a hard limit on the amount of space used. This includes all space consumed by descendants, including file systems and snapshots. Setting a quota on a descendant of a dataset that already has a quota does not override the ancestor's quota, but rather imposes an additional limit. Quotas cannot be set on volumes, as the volsize property acts as an implicit quota.
Full answer by cas: https://unix.stackexchange.com/a/807483 (CC BY-SA 4.0).
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