What is WAFL and its role in ONTAP?

• A. WAFL is the underlying write-anywhere file system used by ONTAP to manage data and metadata, enabling features like snapshots and clones.
• B. WAFL is a web-based administration tool.
• C. WAFL is a caching layer for reads only.
• D. WAFL is a RAID controller.

Answer: (A)

WAFL stands for Write Anywhere File Layout and is the file system engine NetApp uses inside ONTAP to store data and manage the metadata that describes that data. Writing data anywhere on the disks and tracking metadata efficiently enables copy-on-write behavior, which makes snapshots and clones possible and fast without duplicating data. In ONTAP, WAFL provides the file-level operations for NFS and SMB, governs how files and directories are laid out on disk, and coordinates storage efficiency features. It’s not a web admin tool, a caching layer, or a RAID controller—the WAFL file system is the foundation that manages data placement, metadata, and features like snapshots and clones.