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How a FlexVol volume can automatically change its size

A volume can be configured to grow and shrink automatically in response to space usage requirements. Automatic growing occurs when used space exceeds an autogrow threshold. Automatic shrinking occurs when used space drops below an autoshrink threshold.

The autosizing feature consists of two possible functionalities:

Because the size of the Snapshot reserve is a percentage of the size of the volume, Snapshot spill can start to occur or increase as a result of a volume shrinking.