This article is from the storage FAQ part2, by Rodney D. Van Meter with numerous contributions by others.
Runs on Netware servers. Transparent to most clients, but has a neat feature: if you use a special TSR and DLL on client PCs, when it has to retrieve a file from secondary or tertiary storage, it can give you an estimated retrieval time and the option to abort. (516)484-5110, (800)243-9462. (rdv,95/02/14)