This reminds me of OceanStore:

  > OceanStore is a global persistent data store designed to
  > scale to billions of users. It provides a consistent,
  > highly-available, and durable storage utility atop an
  > infrastructure comprised of untrusted servers.

http://oceanstore.cs.berkeley.edu/info/overview.html

It's not productized and pretty difficult to discern the project's status BUT they do seem to publish interesting papers / update their site every so often.