ZFS Quotas and Reservations for File System Data Only

Solaris Express Community Edition, build 77: In addition to the existing ZFS quota and reservation features, this release includes dataset quotas and reservations that do not include descendents, such as snapshots and clones, in the space consumption accounting.

• The refquota property limits the amount of space a dataset can consume. This property enforces a hard limit on the amount of space that can be used. This hard limit does not include space used by descendents, such as snapshots and clones.

• The refreservation property sets the minimum amount of space that is guaranteed to a dataset, not including its descendents.

For example, you can set a 10 Gbyte refquota for studentA that sets a 10-Gbyte hard limit of referenced space. For additional flexibility, you can set a 20-Gbyte quota that allows you to manage studentA's snapshots.

# zfs set refquota=10g tank/studentA
# zfs set quota=20g tank/studentA

For more information, see Setting ZFS Quotas and Reservations.