Sobre o sistema de arquivos ZFS, olha o que está escrito.
ZFS is a 128-bit file system, so it can address 1.84 × 1019 times more data than 64-bit systems such as NTFS. The limitations of ZFS are designed to be so large that they would never be encountered. This was assured by surpassing physical rather than theoretical limitations—there simply is not enough usable matter on the planet Earth to support a maximized ZFS filesystem
Assim que as coisas deviam ser projetadas!