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.
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WAFL uses a copy-on-write technique to minimize the disk space that Snapshots consume.
WAFL is a registered Trademark of Network Appliance.