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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 traditional volumes, the default Snapshot copy reserve is set to 20 percent of the disk space. For FlexVol volumes, the default Snapshot copy reserve is set to 5 percent of the disk space.

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.