This article is from the storage FAQ part2, by Rodney D. Van Meter with numerous contributions by others.
IBM also has HSM for MVS, called, imaginatively, HSM. There is the storage home page. http://www.storage.ibm.com/storage/ I have also found references to System Managed Storage SMS and HSM and DFHSM (Data Facility Hierarchical Storage Manager) but could find no online information. There are probably manuals like DFHSM Version 2 Release 5.0, General Information manual (GH35-0092) if you are a real glutton for punishment and have a friend at ibm. So we have ADSM and DFHSM and DFSMS and probably others. But not much online information. Sorry. A little searching from the http://www.ibm.com might turn up something too. (Del Cecchi, <dcecchi@VNET.IBM.COM>, 1996/3/27)