How to check if Large File Size (LFS) is enabled

To check if a file system supports the LFS standard, you can use the getconf command. If the result is 64, LFS is supported.
getconf FILESIZEBITS /

In the example above, the root file system was checked. If /var for example, is a separate file system, specify /var in its place. You may also use the ‘mount’ command to verify the file system type that is being used. ext2 / ext3, for example, has full support for LFS.

I found this nice read take from suse.de

Kernel 2.6: For both 32-bit systems with option CONFIG_LBD set and for 64-bit systems: The size of a file system is limited to 273 (far too much for today). On 32-bit systems (without CONFIG_LBD set) the size of a file is limited to 2 TiB. Note that not all filesystems and hardware drivers might handle such large filesystems.