Following up on the information iMore received yesterday on potential ZFS hooks in iOS 5.1, a reliable source let us know that Apple has been investing heavily in ZFS appliances from Oracle. (Whether or not this will be made public is unknown; it doesn't seem to be right now.)
Apple may have begun testing what appears to be ZFS (Zettabyte File System) support in the latest iOS 5.1 beta. If the information received by iMore is accurate. references to ZFS, including the mounting tools, are contained deep inside the system files. This raises a lot of questions about where Apple may be taking iOS storage in the future.