Some UNIX commands may not work correctly on file systems larger than one terabyte.

The ustat command returns an EOVERFLOW error for VxFS files systems larger than one terabyte because the variable used to store file system size overflows.

See the ustat(2) manual page.

System administration utilities such as backup may not operate correctly if they are not large file aware. A large file is a file that is larger than two gigabytes. Similarly, utilities that operate at the file system level must be large file aware to operate correctly on large file systems. A large file system is a file system that is larger than one terabyte. You can have a large file system without creating the file system with the mkfs -o largefiles option.

See the lfcompile(5) manual page.