mergerfs/mkdocs/docs/config/deprecated_options.md

Deprecated Options

These are old, deprecated options which may no longer have any function or have been replaced.

• direct_io: Bypass page cache. Use cache.files=off instead.
• kernel_cache: Do not invalidate data cache on file open. Use cache.files=full instead.
• auto_cache: Invalidate data cache if file mtime or size change. Use cache.files=auto-full instead. (default: false)
• async_read: Perform reads asynchronously. Use async_read=true instead.
• sync_read: Perform reads synchronously. Use async_read=false instead.
• splice_read: Does nothing.
• splice_write: Does nothing.
• splice_move: Does nothing.
• allow_other: mergerfs v2.35.0 and above sets this FUSE option automatically if running as root.
• use_ino: Effectively replaced with inodecalc.