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How the guarantee affects FlexVol volume space requirements

The amount of space that a FlexVol volume requires from its aggregate varies depending on the volume's guarantee type. Understanding a volume's space requirement helps you predict how much space becomes available or is required when you change its guarantee or delete the volume.

A volume with a guarantee type of none requires space in the aggregate only for data that is already written to it.

A volume with a guarantee type of volume requires an amount of space in the aggregate equivalent to the volume's size, regardless of how much data (if any) is actually in the volume.

A volume with a guarantee type of file requires enough space in the aggregate to enable writes and overwrites to reserved files or LUNs, even if a block being overwritten is locked by a Snapshot copy or other block-sharing technology.