Version 3 of the NFS protocol enables access to files whose length fits in 64 bits. With version 2, the length had to fit in 32 bits (4 Gbytes).
Access to large files (64-bit) is possible only if the client, server, and the operating system support large files. If the client implementation is limited to 32-bit files, then the client can't access files larger than 32 bits (even if the server supports them). Conversely, if the client supports 64-bit files but the server only supports 32-bit files, the client is limited to 32-bit files. The Solaris 7 operating environment is the first Solaris release that takes advantage of this protocol feature. Operating environments prior to Solaris 7 did not have 64-bit file support.
The limit for the UNIX File System in the Solaris 2.6 and 7 operating environments is 1 Terrabyte (40 bits).