WAFL™(Write Anywhere File Layout), is a file system designed specifically to work in a Network Appliance filer.

Its primary focus is on the algorithms and data structures used to implement Snapshots, which are read-only clones of the active file system taken at specific times.

WAFL uses a copy-on-write technique to minimize the disk space that Snapshots consume.

WAFL is a registered Trademark of Network Appliance.