Whenever Snapshot copies consume more than 100% of the Snapshot reserve, the system is in danger of becoming full. In this case, you can create files only after you delete enough Snapshot copies.
If 500,000 KB (0.5 GB) of data is added to the active file system in the preceding example, a df command generates the following output:
Filesystem kbytes used avail capacity /vol/vol0 3000000 3000000 0 100% /vol/vol0/.snapshot 1000000 3500000 0 350%
As soon as Data ONTAP creates a new Snapshot copy, every disk block in the file system is referenced by some Snapshot copy. Therefore, no matter how many files you delete from the active file system, there is still no room to add any more. The only way to recover from this situation is to delete enough Snapshot copies to free more disk space. For information about how to use the snap list command to determine which Snapshot copies to delete, see “Displaying Snapshot disk consumption statistics”.