Project leader for ZFS, Jeff Bonwick said, “Populating 128-bit file systems would exceed the quantum limits of earth-based storage. You couldn’t fill a 128-bit storage pool without boiling the oceans.”^{[2]}Later he clarified:

“ | Although we’d all like Moore’s Law to continue forever, quantum mechanics imposes some fundamental limits on the computation rate and information capacity of any physical device. In particular, it has been shown that 1 kilogram of matter confined to 1 litre of space can perform at most 10^{51} operations per second on at most 10^{31} bits of information.^{[10]} A fully populated 128-bit storage pool would contain 2^{128} blocks = 2^{137} bytes = 2^{140} bits; therefore the minimum mass required to hold the bits would be (2^{140} bits) / (10^{31} bits/kg) = 136 billion kg. To operate at the 10^{31} bits/kg limit, however, the entire mass of the computer must be in the form of pure energy. By E=mc², the rest energy of 136 billion kg is 1.2×10^{28} J. The mass of the oceans is about 1.4×10^{21} kg. It takes about 4,000 J to raise the temperature of 1 kg of water by 1 degree Celsius, and thus about 400,000 J to heat 1 kg of water from freezing to boiling. The latent heat of vaporization adds another 2 million J/kg. Thus the energy required to boil the oceans is about 2.4×10^{6} J/kg * 1.4×10^{21} kg = 3.4×10^{27} J. Thus, fully populating a 128-bit storage pool would, literally, require more energy than boiling the oceans.^{[11]} |
” |

Also take this

ZFS is a 128-bit file system, so it can address 18 billion billion (1.84 × 10^{19}) times more data than current 64-bit systems. The limitations of ZFS are designed to be so large that they would never be encountered, given the known limits of physics. Some theoretical limits in ZFS are:

- 2
^{64}— Number of snapshots of any file system^{[8]} - 2
^{48}— Number of entries in any individual directory^{[9]} - 16 EiB (2
^{64}bytes) — Maximum size of a file system - 16 EiB — Maximum size of a single file
- 16 EiB — Maximum size of any attribute
- 256 ZiB (2
^{78}bytes) — Maximum size of any zpool - 2
^{56}— Number of attributes of a file (actually constrained to 2^{48}for the number of files in a ZFS file system) - 2
^{56}— Number of files in a directory (actually constrained to 2^{48}for the number of files in a ZFS file system) - 2
^{64}— Number of devices in any zpool - 2
^{64}— Number of zpools in a system - 2
^{64}— Number of file systems in a zpool

Wooow…Thats quite a lot.

The above is taken from wwikipedia. For the full article go to http://en.wikipedia.org/wiki/ZFS

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