Determining the space used by a FlexClone volume

You use a different method to determine the actual space used by FlexClone volumes than for other types of volumes, because a FlexClone volume shares data with its parent volume.

Considerations

When a FlexClone volume is created, it shares all of its data with its parent volume. So even though its logical size is the same as its parent's size, it uses very little free space from the aggregate. The free space used by a newly created FlexClone volume is approximately 0.5% of its logical size. This space is used to store the FlexClone volume's metadata.

New data written to either the parent or the FlexClone volume is not shared between the volumes. The more new data that has been written, the more space the FlexClone volume requires from its containing aggregate.

Steps

Determine the logical size of the FlexClone volume by entering the following command:df -m clone_name
Determine how much space is being shared between the parent and FlexClone volumes by entering the following command:vol clone split estimate clone_name
Subtract the size of the shared space from the logical size of the FlexClone volume to determine the amount of free space being used by the FlexClone volume.

Parent topic: FlexClone volume operations