Calculate reclaimable space before deleting snapshots
Beginning with ONTAP 9.10.1, you can use System Manager to select snapshots you want to delete and calculate the reclaimable space before you delete them.
Steps
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Click Storage > Volumes.
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Select the volume from which you want to delete snapshots.
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Click Snapshot Copies.
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Select one or more snapshots.
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Click Calculate Reclaimable Space.