From: Hierarchical Storage Management

NSL is an industry consortium (American companies only) that has a
version of Unitree, and is creating their own new High Performance
Storage System.

HPSS, among other features, supports striping of removable media, and
full 64-bit files. Some of the work is being done at LLNL, where
UniTree was originally developed.
There's a good overview reachable at
http://www.ccs.ornl.gov/HPSS/HPSS.html.

(rdv,95/1/12)