An inode in ONTAP is a pointer to any file or folder within the file system, including Snapshot copies.
- The number of files a volume can contain is determined by how many inodes it has.
- Inodes point to blocks that make up a file, and inodes also contain the metadata of the file.
- Volumes have both private and public inodes.
- Public inodes are used for files that are visible to the user;
- Private inodes are used for files that are used internally by ONTAP.
- You can change only the maximum number of public inodes for a volume. You cannot affect the number of private inodes.
- Each inode uses 288 bytes of capacity
- This means that having many inodes in a volume can also use up a non-trivial amount of physical space in addition to the capacity of the actual data as well.
- If a file is less than 64 bytes, it is stored in the inode itself and does not use additional capacity.
- Each FlexVol volume has a finite number of inodes and has an absolute maximum of 2,040,109,451.
- The space used by the Inode files counts against the 10% aggregate reserve in ONTAP.