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What the Snapshot copy reserve is

The Snapshot copy reserve sets a specific percent of the disk space for Snapshot copies. For FlexVol volumes, the default Snapshot copy reserve is set to 5 percent of the disk space. By default, the Snapshot copy reserve is 5 percent of the disk space for a FlexVol volume and 0 percent for aggregates.

The active file system cannot consume the Snapshot copy reserve space, but the Snapshot copy reserve, if exhausted, can use space in the active file system.