Позвольте представить: CXFS * Instant data sharing without network mounts or data copies among all major operating systems (IRIX®, Sun™ Solaris™, IBM® AIX®, Windows®, 32-bit Linux®, 64-bit Linux®, Mac OS® X, and other Unix®)
* 64-bit scalability that supports file sizes up to 9 million terabytes, filesystems to 18 million terabytes
* Highly optimized distributed buffering techniques that provide the industry's fastest performance
* High availability with automatic failure detection and recovery
* Wide Area Network (WAN) Filesystem Demonstration
Shared, fast, and reliable data access is critical to closing the gap in managing large data files over long distances.
Вот такие системы нынче в Hi-end, а zfs - это так, начальный уровень.
http://www.sgi.com/products/storage/software/cxfs.html
http://www.nasi.com/sgi_cxfs.php
И размер вполне адекватный - 1.8*10^18