You can display the amount of space you can reclaim by deleting one or more Snapshot copies in a volume by using the snap reclaimable command. The amount of space displayed is an approximation because writing to the volume, creating Snapshot copies, or deleting Snapshot copies causes the reclaimed amount to change.
The following command displays the amount of space reclaimed by deleting the hourly.4, hourly.5, and nightly.0 Snapshot copies in the vol1 volume:
system> snap reclaimable vol1 hourly.4 hourly.5 nightly.0 Processing (Press Ctrl-C to exit) ... snap reclaimable: Approximately 240 kbytes would be freed.