If a mount succeeds and nolargefiles is specified, the file system cannot contain or create any large files. If a mount succeeds and largefiles is specified, the file system may contain and create large files.

The mount command fails if the specified largefiles|nolargefiles option does not match the on-disk flag.

Because the mount command defaults to match the current setting of the on-disk flag if specified without the largefiles or nolargefiles option, the best practice is not to specify either option. After a file system is mounted, you can use the fsadm utility to change the large files option.